Fix one-epoch track GRU smoke launcher

run_easycom_track_gru_residual.sh

@@ -11,7 +11,14 @@ CHECKPOINT_ROOT=${CHECKPOINT_ROOT:-checkpoints/easycom_track_gru_residual}
 RESULT_ROOT=${RESULT_ROOT:-results/easycom_track_gru_residual}
 TEST_RESULT_ROOT=${TEST_RESULT_ROOT:-results/easycom_track_gru_residual_test}
 EPOCHS=${EPOCHS:-4}
-WARMUP_EPOCHS=${WARMUP_EPOCHS:-1.6}
+if [[ -z "${WARMUP_EPOCHS:-}" ]]; then
+  # Keep the four-epoch screen unchanged, but make EPOCHS=1 smoke runs valid.
+  if (( EPOCHS == 1 )); then
+    WARMUP_EPOCHS=0
+  else
+    WARMUP_EPOCHS=1.6
+  fi
+fi
 LOCAL_PROJECTION_DIM=${LOCAL_PROJECTION_DIM:-256}
 PERSON_ATTENTION_DIM=${PERSON_ATTENTION_DIM:-256}
 PERSON_ATTENTION_HEADS=${PERSON_ATTENTION_HEADS:-4}
@@ -147,6 +154,7 @@ if [[ "$variant" == test ]]; then
       fi
       if [[ ! -s "$checkpoint" ]]; then
         echo "Missing checkpoint: $checkpoint" >&2
+        echo "The test mode is inference-only; run 'all' for these seeds first." >&2
         exit 1
       fi
       echo "$(date): final test ${selected}, seed=${seed}"