correct overlapping checkpoint evaluation

scripts/train_operator_yolo_detector.sh

@@ -56,6 +56,7 @@ fi
 SCRIPT_DIR="$(cd "$(dirname "${BASH_SOURCE[0]}")" && pwd)"
 
 DATASET_YAML="${OPERATOR_YOLO_DATASET_DIR%/}/dataset.yaml"
+NO_TRAINING_MARKER="${OPERATOR_YOLO_DATASET_DIR%/}/NO_TRAINING.json"
 SUMMARY_PATH="${TRAIN_OUTPUT_DIR%/}/${TRAIN_RUN_NAME}/training_summary.json"
 export DATASET_YAML
 export YOLO_BASE_MODEL_PATH
@@ -76,6 +77,11 @@ if [[ ! -f "${DATASET_YAML}" ]]; then
   exit 1
 fi
 
+if [[ -f "${NO_TRAINING_MARKER}" ]]; then
+  echo "Training is prohibited for this evaluation-only dataset: ${NO_TRAINING_MARKER}" >&2
+  exit 1
+fi
+
 if [[ ! -f "${YOLO_BASE_MODEL_PATH}" ]]; then
   echo "Base model file not found: ${YOLO_BASE_MODEL_PATH}" >&2
   exit 1