825 lines
28 KiB
Python
825 lines
28 KiB
Python
"""Shared head, labels, and metrics for the EasyCom/Ego4D experiments."""
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from __future__ import annotations
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import csv
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from dataclasses import dataclass
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from pathlib import Path
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from typing import Any, Literal, Sequence
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from uuid import UUID
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import numpy as np
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import torch
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from torch import nn
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OFFICIAL_TRAIN_SESSIONS = (
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"Session_7",
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"Session_11",
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"Session_10",
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"Session_6",
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"Session_9",
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"Session_4",
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"Session_8",
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"Session_5",
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"Session_12",
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)
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OFFICIAL_TEST_SESSIONS = ("Session_3", "Session_2", "Session_1")
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CLASS_NAMES = (
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"background",
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"camera_wearer_speaking",
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"other_people_speaking",
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)
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FOUR_STATE_NAMES = (
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"silence",
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"wearer_only",
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"others_only",
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"overlap",
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)
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STEP_SECONDS = 0.2
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NUM_HORIZONS = 10
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NUM_CLASSES = 3
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NUM_FOUR_STATES = len(FOUR_STATE_NAMES)
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LOSS_NAMES = (
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"lstr-mce",
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"miniroad-normalized",
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"independent-bce",
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"four-state-ce",
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)
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TRANSITION_OBJECTIVE_NAMES = (
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"none",
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"r1-supervised",
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"r2-expected-reward",
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)
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DATASET_NAMES = ("easycom", "ego4d")
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LAYER_FUSION_MODES = (
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"single",
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"fixed-mean",
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"scalar-mixture",
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"concat-mlp",
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)
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DatasetName = Literal["easycom", "ego4d"]
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class TurnPredictionHead(nn.Module):
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"""Map one Omni state to configurable ``[horizon, output]`` logits."""
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def __init__(
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self,
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hidden_size: int = 2048,
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num_horizons: int = NUM_HORIZONS,
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num_classes: int = NUM_CLASSES,
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dropout: float = 0.1,
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num_input_layers: int = 1,
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learnable_layer_mixture: bool = False,
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layer_fusion: str | None = None,
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transition_auxiliary: bool = False,
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) -> None:
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super().__init__()
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if num_input_layers <= 0:
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raise ValueError("num_input_layers must be positive")
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if layer_fusion is None:
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layer_fusion = (
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"scalar-mixture" if learnable_layer_mixture else "single"
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)
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if layer_fusion not in LAYER_FUSION_MODES:
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raise ValueError(
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f"Unknown layer_fusion={layer_fusion!r}; expected one of "
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f"{LAYER_FUSION_MODES}"
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)
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if learnable_layer_mixture and layer_fusion != "scalar-mixture":
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raise ValueError(
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"learnable_layer_mixture=True is only compatible with "
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"layer_fusion='scalar-mixture'"
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)
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if layer_fusion != "single" and num_input_layers < 2:
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raise ValueError(
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f"layer_fusion={layer_fusion!r} requires at least two input layers"
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)
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if layer_fusion == "single" and num_input_layers != 1:
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raise ValueError(
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"Multiple input layers require a non-single layer_fusion"
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)
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self.hidden_size = hidden_size
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self.num_horizons = num_horizons
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self.num_classes = num_classes
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self.dropout = dropout
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self.num_input_layers = num_input_layers
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self.layer_fusion = layer_fusion
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self.learnable_layer_mixture = layer_fusion == "scalar-mixture"
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self.transition_auxiliary = transition_auxiliary
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if self.learnable_layer_mixture:
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# Zero initialization exactly reproduces a uniform layer mean at
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# step zero while allowing training to select useful query layers.
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self.layer_logits = nn.Parameter(torch.zeros(num_input_layers))
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else:
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self.register_parameter("layer_logits", None)
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if layer_fusion == "concat-mlp":
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fusion_input_size = num_input_layers * hidden_size
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self.layer_fusion_net: nn.Module | None = nn.Sequential(
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nn.LayerNorm(fusion_input_size),
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nn.Linear(fusion_input_size, hidden_size),
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nn.GELU(),
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)
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else:
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self.layer_fusion_net = None
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self.net = nn.Sequential(
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nn.LayerNorm(hidden_size),
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nn.Linear(hidden_size, hidden_size // 2),
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nn.GELU(),
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nn.Dropout(dropout),
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nn.Linear(hidden_size // 2, num_horizons * num_classes),
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)
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self.transition_head: nn.Module | None
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if transition_auxiliary:
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# Share the activity MLP trunk and add only a small binary readout
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# for each future horizon.
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self.transition_head = nn.Linear(hidden_size // 2, num_horizons)
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else:
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self.transition_head = None
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def _fuse_layers(self, states: torch.Tensor) -> torch.Tensor:
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if states.shape[-1] != self.hidden_size:
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raise ValueError(
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f"Expected hidden size {self.hidden_size}, got {states.shape[-1]}"
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)
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if self.layer_fusion != "single":
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if states.ndim < 3 or states.shape[-2] != self.num_input_layers:
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raise ValueError(
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"Multi-layer input must end in "
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f"[{self.num_input_layers},{self.hidden_size}], got "
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f"{tuple(states.shape)}"
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)
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if self.layer_fusion == "fixed-mean":
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states = states.mean(dim=-2)
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elif self.layer_fusion == "scalar-mixture":
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assert self.layer_logits is not None
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weights = self.layer_logits.softmax(dim=0).to(states.dtype)
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view_shape = (1,) * (states.ndim - 2) + (
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self.num_input_layers,
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1,
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)
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states = (states * weights.view(view_shape)).sum(dim=-2)
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elif self.layer_fusion == "concat-mlp":
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assert self.layer_fusion_net is not None
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states = states.flatten(start_dim=-2)
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states = self.layer_fusion_net(states)
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return states
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def _shared_features(self, states: torch.Tensor) -> torch.Tensor:
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"""Return the activity MLP representation shared by both readouts."""
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states = self._fuse_layers(states)
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return self.net[:-1](states)
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def forward(self, states: torch.Tensor) -> torch.Tensor:
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features = self._shared_features(states)
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logits = self.net[-1](features)
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return logits.view(
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*features.shape[:-1], self.num_horizons, self.num_classes
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)
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def forward_with_transition(
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self,
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states: torch.Tensor,
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) -> tuple[torch.Tensor, torch.Tensor]:
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"""Return activity logits and binary transition logits."""
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if self.transition_head is None:
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raise RuntimeError(
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"This head was created without transition_auxiliary=True"
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)
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features = self._shared_features(states)
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activity_logits = self.net[-1](features).view(
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*features.shape[:-1],
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self.num_horizons,
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self.num_classes,
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)
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transition_logits = self.transition_head(features)
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return activity_logits, transition_logits
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def layer_mixture_weights(self) -> torch.Tensor | None:
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"""Return normalized oldest-to-newest layer weights, if enabled."""
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if self.layer_logits is None:
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return None
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return self.layer_logits.softmax(dim=0)
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def _validate_loss_inputs(
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logits: torch.Tensor,
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targets: torch.Tensor,
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*,
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num_output_classes: int = NUM_CLASSES,
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) -> None:
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if logits.shape != targets.shape:
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raise ValueError(
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f"logits/targets shape mismatch: {tuple(logits.shape)} vs "
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f"{tuple(targets.shape)}"
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)
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if logits.shape[-1] != num_output_classes:
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raise ValueError(
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f"Expected {num_output_classes} classes, got {logits.shape[-1]}"
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)
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def _validated_binary_activity_targets(targets: torch.Tensor) -> torch.Tensor:
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"""Validate the four legal EasyCom/EgoSpeak three-label activity rows."""
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if targets.ndim < 1 or targets.shape[-1] != NUM_CLASSES:
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raise ValueError(
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f"Expected activity targets [...,{NUM_CLASSES}], got "
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f"{tuple(targets.shape)}"
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)
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if not torch.isfinite(targets).all():
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raise ValueError("Activity targets contain NaN or Inf")
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rounded = targets.round()
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if not torch.allclose(targets, rounded, atol=1e-6, rtol=0.0):
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raise ValueError("Activity targets must contain only binary 0/1 values")
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expected_background = (rounded[..., 1:].sum(dim=-1) == 0).to(rounded.dtype)
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if not torch.equal(rounded[..., 0], expected_background):
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raise ValueError(
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"Activity targets must be one of [1,0,0], [0,1,0], "
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"[0,0,1], or [0,1,1]"
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)
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return rounded
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def activity_targets_to_four_states(targets: torch.Tensor) -> torch.LongTensor:
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"""Map three-label activity targets to silence/wearer/others/overlap."""
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targets = _validated_binary_activity_targets(targets)
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return (targets[..., 1] + 2 * targets[..., 2]).long()
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def transition_targets_from_activity(
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activity_sequence: torch.Tensor,
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) -> torch.Tensor:
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"""Mark every activity-state change between adjacent 5 Hz target rows.
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The input ends in [time, 3] and the output ends in [time - 1].
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A silence/onset, offset, speaker handover, or overlap-state change is one
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positive transition.
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"""
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activity_sequence = _validated_binary_activity_targets(activity_sequence)
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if activity_sequence.ndim < 2 or activity_sequence.shape[-2] < 2:
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raise ValueError(
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"Activity sequence must contain at least two target rows, got "
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f"{tuple(activity_sequence.shape)}"
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)
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changed = activity_sequence[..., 1:, :] != activity_sequence[..., :-1, :]
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return changed.any(dim=-1).to(activity_sequence.dtype)
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def weighted_transition_bce_loss(
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logits: torch.Tensor,
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targets: torch.Tensor,
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*,
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pos_weight: float = 3.0,
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) -> torch.Tensor:
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"""Binary transition loss with an explicit positive-class weight."""
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if logits.shape != targets.shape:
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raise ValueError(
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f"Transition logits/targets mismatch: {tuple(logits.shape)} vs "
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f"{tuple(targets.shape)}"
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)
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if pos_weight <= 0:
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raise ValueError("Transition pos_weight must be positive")
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targets = targets.to(device=logits.device, dtype=logits.dtype)
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if not torch.isfinite(targets).all() or not torch.all(
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(targets == 0) | (targets == 1)
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):
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raise ValueError("Transition targets must contain only finite 0/1 values")
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return nn.functional.binary_cross_entropy_with_logits(
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logits,
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targets,
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pos_weight=logits.new_tensor(pos_weight),
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)
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def expected_transition_reward(
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logits: torch.Tensor,
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targets: torch.Tensor,
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*,
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pos_weight: float = 3.0,
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) -> torch.Tensor:
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"""Exact expected weighted correctness of a Bernoulli transition policy.
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Correct transition/non-transition actions receive reward one and incorrect
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actions zero. The expectation is evaluated analytically rather than by
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sampling, and normalized by the sum of example weights to remain in [0, 1].
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"""
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if logits.shape != targets.shape:
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raise ValueError(
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f"Transition logits/targets mismatch: {tuple(logits.shape)} vs "
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f"{tuple(targets.shape)}"
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)
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if pos_weight <= 0:
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raise ValueError("Transition pos_weight must be positive")
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targets = targets.to(device=logits.device, dtype=logits.dtype)
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if not torch.isfinite(targets).all() or not torch.all(
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(targets == 0) | (targets == 1)
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):
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raise ValueError("Transition targets must contain only finite 0/1 values")
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probability = logits.sigmoid()
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probability_correct = (
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targets * probability + (1.0 - targets) * (1.0 - probability)
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)
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weights = 1.0 + (pos_weight - 1.0) * targets
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return (weights * probability_correct).sum() / weights.sum()
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def transition_aware_objective(
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activity_loss: torch.Tensor,
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transition_logits: torch.Tensor,
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transition_targets: torch.Tensor,
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*,
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objective: str,
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transition_weight: float = 0.2,
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pos_weight: float = 3.0,
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reward_weight: float = 0.1,
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) -> dict[str, torch.Tensor]:
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"""Compose the R1 or R2 transition-aware training objective."""
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if objective not in TRANSITION_OBJECTIVE_NAMES[1:]:
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raise ValueError(
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f"Transition objective must be R1 or R2, got {objective!r}"
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)
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if transition_weight < 0 or reward_weight < 0:
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raise ValueError("Transition and reward weights must be non-negative")
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transition_loss = weighted_transition_bce_loss(
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transition_logits,
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transition_targets,
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pos_weight=pos_weight,
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)
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expected_reward = expected_transition_reward(
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transition_logits,
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transition_targets,
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pos_weight=pos_weight,
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)
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applied_reward = (
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expected_reward
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if objective == "r2-expected-reward"
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else expected_reward.detach().new_zeros(())
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)
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total = (
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activity_loss
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+ transition_weight * transition_loss
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- reward_weight * applied_reward
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)
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return {
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"total": total,
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"activity": activity_loss,
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"transition": transition_loss,
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"expected_reward": expected_reward,
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"applied_reward": applied_reward,
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}
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def output_classes_for_loss(loss_name: str) -> int:
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"""Return the number of head logits required by one training objective."""
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if loss_name not in LOSS_NAMES:
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raise ValueError(f"Unknown loss {loss_name!r}; expected one of {LOSS_NAMES}")
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return NUM_FOUR_STATES if loss_name == "four-state-ce" else NUM_CLASSES
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def output_space_for_loss(loss_name: str) -> str:
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"""Return a stable checkpoint description of the head output space."""
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output_classes_for_loss(loss_name)
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if loss_name == "four-state-ce":
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return "four-state-softmax"
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if loss_name == "independent-bce":
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return "three-label-sigmoid"
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return "three-class-softmax"
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def head_output_names_for_loss(loss_name: str) -> tuple[str, ...]:
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output_classes_for_loss(loss_name)
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return FOUR_STATE_NAMES if loss_name == "four-state-ce" else CLASS_NAMES
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def egospeak_multihorizon_loss(
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logits: torch.Tensor,
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targets: torch.Tensor,
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*,
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reduction: Literal["mean", "sum", "none"] = "mean",
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) -> torch.Tensor:
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"""Reproduce the LSTR ``MCE`` loss used by the supplied shell/config.
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EasyCom targets may contain both active speaker classes as ``[0, 1, 1]``.
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LSTR preserves those weights directly and sums their negative log-softmax
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terms. It does not normalize the target row.
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"""
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_validate_loss_inputs(logits, targets)
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targets = targets.to(device=logits.device, dtype=logits.dtype)
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loss = -(targets * nn.functional.log_softmax(logits, dim=-1)).sum(dim=-1)
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if reduction == "mean":
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return loss.mean()
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if reduction == "sum":
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return loss.sum()
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if reduction == "none":
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return loss
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raise ValueError(f"Unknown reduction: {reduction}")
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def miniroad_multihorizon_loss(
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logits: torch.Tensor,
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targets: torch.Tensor,
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*,
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reduction: Literal["mean", "sum", "none"] = "mean",
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) -> torch.Tensor:
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"""Reproduce MiniROAD's L2-normalized multi-positive anticipation loss."""
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_validate_loss_inputs(logits, targets)
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targets = nn.functional.normalize(
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targets.to(device=logits.device, dtype=logits.dtype),
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p=2,
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dim=-1,
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)
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loss = -(targets * nn.functional.log_softmax(logits, dim=-1)).sum(dim=-1)
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if reduction == "mean":
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return loss.mean()
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if reduction == "sum":
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return loss.sum()
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if reduction == "none":
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return loss
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raise ValueError(f"Unknown reduction: {reduction}")
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def independent_bce_multihorizon_loss(
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logits: torch.Tensor,
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targets: torch.Tensor,
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*,
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reduction: Literal["mean", "sum", "none"] = "mean",
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) -> torch.Tensor:
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"""Independent sigmoid/BCE loss for the three marginal activity labels."""
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_validate_loss_inputs(logits, targets)
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targets = targets.to(
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device=logits.device,
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dtype=logits.dtype,
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)
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element_loss = nn.functional.binary_cross_entropy_with_logits(
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logits,
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targets,
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reduction="none",
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)
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if reduction == "mean":
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return element_loss.mean()
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if reduction == "sum":
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return element_loss.sum()
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if reduction == "none":
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return element_loss
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raise ValueError(f"Unknown reduction: {reduction}")
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def four_state_multihorizon_loss(
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logits: torch.Tensor,
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targets: torch.Tensor,
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*,
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reduction: Literal["mean", "sum", "none"] = "mean",
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) -> torch.Tensor:
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"""Four-state CE for silence, wearer-only, others-only, and overlap."""
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if logits.ndim < 1 or logits.shape[-1] != NUM_FOUR_STATES:
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raise ValueError(
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f"Expected four-state logits [...,{NUM_FOUR_STATES}], got "
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f"{tuple(logits.shape)}"
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)
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if logits.shape[:-1] != targets.shape[:-1] or targets.shape[-1] != NUM_CLASSES:
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raise ValueError(
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"Four-state logits/activity target shape mismatch: "
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f"{tuple(logits.shape)} vs {tuple(targets.shape)}"
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)
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state_targets = (targets[..., 1] + 2 * targets[..., 2]).long().to(
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logits.device
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)
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loss = nn.functional.cross_entropy(
|
|
logits.reshape(-1, NUM_FOUR_STATES),
|
|
state_targets.reshape(-1),
|
|
reduction="none",
|
|
).reshape(logits.shape[:-1])
|
|
if reduction == "mean":
|
|
return loss.mean()
|
|
if reduction == "sum":
|
|
return loss.sum()
|
|
if reduction == "none":
|
|
return loss
|
|
raise ValueError(f"Unknown reduction: {reduction}")
|
|
|
|
|
|
def marginal_probabilities_from_logits(
|
|
logits: torch.Tensor,
|
|
loss_name: str,
|
|
) -> torch.Tensor:
|
|
"""Convert any supported head output to three EgoSpeak marginals.
|
|
|
|
Four-state marginals deliberately are not renormalized: wearer and others
|
|
may both be near one when the overlap state is likely.
|
|
"""
|
|
|
|
expected_classes = output_classes_for_loss(loss_name)
|
|
if logits.ndim < 1 or logits.shape[-1] != expected_classes:
|
|
raise ValueError(
|
|
f"Loss {loss_name!r} expects {expected_classes} logits, got "
|
|
f"{tuple(logits.shape)}"
|
|
)
|
|
if loss_name == "independent-bce":
|
|
return logits.sigmoid()
|
|
probabilities = logits.softmax(dim=-1)
|
|
if loss_name != "four-state-ce":
|
|
return probabilities
|
|
return torch.stack(
|
|
(
|
|
probabilities[..., 0],
|
|
probabilities[..., 1] + probabilities[..., 3],
|
|
probabilities[..., 2] + probabilities[..., 3],
|
|
),
|
|
dim=-1,
|
|
)
|
|
|
|
|
|
def multihorizon_cross_entropy(
|
|
logits: torch.Tensor,
|
|
targets: torch.Tensor,
|
|
) -> torch.Tensor:
|
|
"""Backward-compatible alias for the LSTR/EgoSpeak loss."""
|
|
|
|
return egospeak_multihorizon_loss(logits, targets)
|
|
|
|
|
|
def normalize_session_name(value: str | int) -> str:
|
|
text = str(value)
|
|
if text.startswith("Session_"):
|
|
suffix = text.removeprefix("Session_")
|
|
else:
|
|
suffix = text
|
|
if not suffix.isdigit():
|
|
raise ValueError(f"Invalid EasyCom session: {value}")
|
|
return f"Session_{int(suffix)}"
|
|
|
|
|
|
def normalize_sample_name(
|
|
value: str | int,
|
|
dataset: DatasetName = "easycom",
|
|
) -> str:
|
|
"""Return the canonical EasyCom session name or Ego4D clip UUID."""
|
|
|
|
if dataset == "easycom":
|
|
return normalize_session_name(value)
|
|
if dataset != "ego4d":
|
|
raise ValueError(f"Unknown dataset: {dataset}")
|
|
|
|
text = str(value).strip()
|
|
try:
|
|
return str(UUID(text))
|
|
except (ValueError, AttributeError) as error:
|
|
raise ValueError(f"Invalid Ego4D clip UUID: {value}") from error
|
|
|
|
|
|
def load_ego4d_manifest_split(
|
|
manifest: str | Path,
|
|
split: Literal["train", "test"],
|
|
) -> list[str]:
|
|
"""Load one ordered UID split from ``ego4d_egospeak.tsv``."""
|
|
|
|
path = Path(manifest)
|
|
if not path.is_file():
|
|
raise FileNotFoundError(path)
|
|
|
|
selected: list[str] = []
|
|
seen: set[str] = set()
|
|
with path.open(newline="") as file:
|
|
reader = csv.DictReader(file, delimiter="\t")
|
|
columns = set(reader.fieldnames or [])
|
|
required = {"split", "uid"}
|
|
if not required.issubset(columns):
|
|
raise ValueError(
|
|
f"Manifest must contain {sorted(required)}, got "
|
|
f"{reader.fieldnames}: {path}"
|
|
)
|
|
for row_number, row in enumerate(reader, start=2):
|
|
row_split = row["split"].strip()
|
|
if row_split not in {"train", "test"}:
|
|
raise ValueError(
|
|
f"Invalid split {row_split!r} at {path}:{row_number}"
|
|
)
|
|
uid = normalize_sample_name(row["uid"], "ego4d")
|
|
if uid in seen:
|
|
raise ValueError(
|
|
f"Duplicate Ego4D UID {uid} at {path}:{row_number}"
|
|
)
|
|
seen.add(uid)
|
|
if row_split == split:
|
|
selected.append(uid)
|
|
|
|
if not selected:
|
|
raise ValueError(f"No {split!r} samples found in {path}")
|
|
return selected
|
|
|
|
|
|
@dataclass
|
|
class SessionData:
|
|
name: str
|
|
states: torch.Tensor
|
|
targets: torch.Tensor
|
|
label_indices: torch.LongTensor
|
|
feature_metadata: dict[str, Any]
|
|
|
|
@property
|
|
def hidden_size(self) -> int:
|
|
return int(self.states.shape[-1])
|
|
|
|
@property
|
|
def num_input_layers(self) -> int:
|
|
return 1 if self.states.ndim == 2 else int(self.states.shape[-2])
|
|
|
|
def future_examples(
|
|
self,
|
|
num_horizons: int = NUM_HORIZONS,
|
|
) -> tuple[torch.Tensor, torch.Tensor, torch.LongTensor]:
|
|
"""Return states, future labels, and target indices for valid rows."""
|
|
|
|
offsets = torch.arange(1, num_horizons + 1, dtype=torch.long)
|
|
future_indices = self.label_indices[:, None] + offsets[None, :]
|
|
valid = (future_indices >= 0).all(dim=1) & (
|
|
future_indices < len(self.targets)
|
|
).all(dim=1)
|
|
rows = future_indices[valid]
|
|
return self.states[valid], self.targets[rows], rows
|
|
|
|
|
|
def load_session_data(
|
|
feature_root: str | Path,
|
|
target_root: str | Path,
|
|
session: str | int,
|
|
*,
|
|
expected_mode: str | None = "causal-prefix",
|
|
dataset: DatasetName = "easycom",
|
|
) -> SessionData:
|
|
"""Load and validate one saved Omni feature payload and target array."""
|
|
|
|
name = normalize_sample_name(session, dataset)
|
|
feature_path = Path(feature_root) / f"{name}.pt"
|
|
target_path = Path(target_root) / f"{name}.npy"
|
|
if not feature_path.is_file():
|
|
raise FileNotFoundError(feature_path)
|
|
if not target_path.is_file():
|
|
raise FileNotFoundError(target_path)
|
|
|
|
payload = torch.load(feature_path, map_location="cpu", weights_only=False)
|
|
if not isinstance(payload, dict) or "states" not in payload:
|
|
raise ValueError(f"Invalid feature payload: {feature_path}")
|
|
states = payload["states"]
|
|
if not isinstance(states, torch.Tensor) or states.ndim not in {2, 3}:
|
|
raise ValueError(f"states must be [T,D] or [T,L,D] in {feature_path}")
|
|
if states.ndim == 3 and states.shape[1] < 2:
|
|
raise ValueError(
|
|
f"Stacked states must contain at least two layers: {feature_path}"
|
|
)
|
|
if not torch.is_floating_point(states):
|
|
raise ValueError(f"states must be floating point in {feature_path}")
|
|
if not torch.isfinite(states).all():
|
|
raise ValueError(f"states contain NaN/Inf in {feature_path}")
|
|
|
|
mode = payload.get("mode")
|
|
if expected_mode is not None and mode != expected_mode:
|
|
raise ValueError(
|
|
f"{feature_path} mode is {mode!r}, expected {expected_mode!r}"
|
|
)
|
|
label_indices = payload.get("label_indices")
|
|
if label_indices is None:
|
|
raise ValueError(f"Missing label_indices in {feature_path}")
|
|
label_indices = torch.as_tensor(label_indices, dtype=torch.long)
|
|
if label_indices.ndim != 1 or len(label_indices) != len(states):
|
|
raise ValueError(f"Invalid label_indices in {feature_path}")
|
|
if len(label_indices) and not torch.equal(
|
|
label_indices,
|
|
torch.arange(len(label_indices), dtype=torch.long),
|
|
):
|
|
raise ValueError(
|
|
f"{feature_path} does not use the verified zero-based dense alignment"
|
|
)
|
|
|
|
target_array = np.load(target_path, allow_pickle=False)
|
|
if target_array.ndim != 2 or target_array.shape[1] != NUM_CLASSES:
|
|
raise ValueError(
|
|
f"Expected target [T,{NUM_CLASSES}], got {target_array.shape}: "
|
|
f"{target_path}"
|
|
)
|
|
targets = torch.from_numpy(np.asarray(target_array, dtype=np.float32))
|
|
_validated_binary_activity_targets(targets)
|
|
if len(label_indices) and int(label_indices[-1]) >= len(targets):
|
|
raise ValueError(
|
|
f"Last label index {int(label_indices[-1])} exceeds target length "
|
|
f"{len(targets)} in {name}"
|
|
)
|
|
if len(states) != len(targets):
|
|
raise ValueError(
|
|
f"{name}: feature/target length mismatch: {len(states)} vs "
|
|
f"{len(targets)}"
|
|
)
|
|
|
|
metadata = {
|
|
key: payload.get(key)
|
|
for key in (
|
|
"model_id",
|
|
"mode",
|
|
"config",
|
|
"start",
|
|
"end",
|
|
"num_steps",
|
|
"video_sampling_grid",
|
|
)
|
|
}
|
|
return SessionData(name, states, targets, label_indices, metadata)
|
|
|
|
|
|
def average_precision_metrics(
|
|
scores: np.ndarray,
|
|
targets: np.ndarray,
|
|
) -> dict[str, Any]:
|
|
"""Compute EgoSpeak frame AP for all three classes, including background."""
|
|
|
|
from sklearn.metrics import average_precision_score
|
|
|
|
scores = np.asarray(scores, dtype=np.float64)
|
|
targets = np.asarray(targets, dtype=np.float64)
|
|
if scores.shape != targets.shape or scores.ndim != 2:
|
|
raise ValueError(
|
|
f"scores/targets must have equal [N,C] shape, got "
|
|
f"{scores.shape} and {targets.shape}"
|
|
)
|
|
if scores.shape[1] != NUM_CLASSES:
|
|
raise ValueError(f"Expected {NUM_CLASSES} classes, got {scores.shape[1]}")
|
|
|
|
aps = average_precision_score(targets, scores, average=None)
|
|
return {
|
|
"num_steps": int(len(scores)),
|
|
"class_ap": {
|
|
name: float(value) for name, value in zip(CLASS_NAMES, aps)
|
|
},
|
|
"map": float(np.mean(aps)),
|
|
}
|
|
|
|
|
|
def checkpoint_head_config(payload: dict[str, Any]) -> dict[str, Any]:
|
|
"""Return a validated head config, including legacy-checkpoint defaults."""
|
|
|
|
config = dict(payload.get("head_config", {}))
|
|
config.setdefault("hidden_size", 2048)
|
|
config.setdefault("num_horizons", NUM_HORIZONS)
|
|
config.setdefault("num_classes", NUM_CLASSES)
|
|
config.setdefault("dropout", 0.1)
|
|
config.setdefault("num_input_layers", 1)
|
|
config.setdefault("learnable_layer_mixture", False)
|
|
config.setdefault("transition_auxiliary", False)
|
|
config.setdefault(
|
|
"layer_fusion",
|
|
(
|
|
"scalar-mixture"
|
|
if config["learnable_layer_mixture"]
|
|
else "single"
|
|
),
|
|
)
|
|
return config
|
|
|
|
|
|
def checkpoint_loss_name(payload: dict[str, Any]) -> str:
|
|
"""Read the objective from a checkpoint, defaulting legacy files to MCE."""
|
|
|
|
training_config = payload.get("training_config", {})
|
|
if not isinstance(training_config, dict):
|
|
raise ValueError("Checkpoint training_config must be a mapping")
|
|
loss_name = str(training_config.get("loss", "lstr-mce"))
|
|
expected_classes = output_classes_for_loss(loss_name)
|
|
actual_classes = int(checkpoint_head_config(payload)["num_classes"])
|
|
if actual_classes != expected_classes:
|
|
raise ValueError(
|
|
f"Checkpoint loss {loss_name!r} requires {expected_classes} head "
|
|
f"outputs, but head_config has {actual_classes}"
|
|
)
|
|
recorded_space = payload.get("output_space")
|
|
expected_space = output_space_for_loss(loss_name)
|
|
if recorded_space is not None and recorded_space != expected_space:
|
|
raise ValueError(
|
|
f"Checkpoint output_space is {recorded_space!r}, expected "
|
|
f"{expected_space!r} for loss {loss_name!r}"
|
|
)
|
|
return loss_name
|
|
|
|
|
|
def validate_disjoint_sessions(
|
|
first: Sequence[str],
|
|
second: Sequence[str],
|
|
) -> None:
|
|
overlap = set(first) & set(second)
|
|
if overlap:
|
|
raise ValueError(f"Session sets overlap: {sorted(overlap)}")
|