[TTS] MagpieTTS inference: Add command line option to select a subset of datasets to run inference on (NVIDIA-NeMo#15212)

* Added datasets filtering to the inference script

New command line argument: --datasets <dataset1,dataset2,...> where
dataset1, dataset2, ... are the names datasets to process in the
datasets_json_path file.

If not specified, all datasets in the datasets_json_path will be processed.
If specified, only the datasets in the list will be processed.

Signed-off-by: Fejgin, Roy <rfejgin@nvidia.com>

* Refined datasets filtering in the inference script

* Correctly handle comma-separated list of dataset names in the --datasets argument.
* Help text

Signed-off-by: Fejgin, Roy <rfejgin@nvidia.com>

---------

Signed-off-by: Fejgin, Roy <rfejgin@nvidia.com>
Signed-off-by: Akhil Varanasi <akhilvaranasi23@gmail.com>

Author: rfejgin

examples/tts/magpietts_inference.py

@@ -117,11 +117,27 @@ def create_formatted_metrics_mean_ci(metrics_mean_ci: dict) -> dict:
     return metrics_mean_ci
 
 
+def filter_datasets(dataset_meta_info: dict, datasets: Optional[List[str]]) -> List[str]:
+    """Select datasets from the dataset meta info."""
+    if datasets is None:
+        # Dataset filtering not specified, return all datasets
+        return list(dataset_meta_info.keys())
+    else:
+        datasets = datasets.split(",")
+        # Check if datasets are valid
+        for dataset in datasets:
+            if dataset not in dataset_meta_info:
+                raise ValueError(f"Dataset {dataset} not found in dataset meta info")
+        # Return all requsted datasets
+        return datasets
+
+
 def run_inference_and_evaluation(
     model_config: ModelLoadConfig,
     inference_config: InferenceConfig,
     eval_config: EvaluationConfig,
     dataset_meta_info: dict,
+    datasets: Optional[List[str]],
     out_dir: str,
     num_repeats: int = 1,
     confidence_level: float = 0.95,
@@ -141,6 +157,8 @@ def run_inference_and_evaluation(
         inference_config: Configuration for inference.
         eval_config: Configuration for evaluation.
         dataset_meta_info: Dictionary containing dataset metadata.
+        datasets: List of dataset names to run inference and evaluation on. If None, all datasets in the
+                  dataset meta info will be processed.
         out_dir: Output directory for results.
         num_repeats: Number of times to repeat inference (for CI estimation).
         confidence_level: Confidence level for CI calculation.
@@ -175,7 +193,6 @@ def run_inference_and_evaluation(
     runner = MagpieInferenceRunner(model, inference_config)
 
     # Tracking metrics across datasets
-    datasets = list(dataset_meta_info.keys())
     ssim_per_dataset = []
     cer_per_dataset = []
     all_datasets_filewise_metrics = {}
@@ -374,8 +391,15 @@ def create_argument_parser() -> argparse.ArgumentParser:
     data_group.add_argument(
         '--datasets_json_path',
         type=str,
+        required=True,
+        default=None,
+        help='Path to dataset configuration JSON file (will process all datasets in the file if --datasets is not specified)',
+    )
+    data_group.add_argument(
+        '--datasets',
+        type=str,
         default=None,
-        help='Path to dataset configuration JSON file (will process all datasets in the file)',
+        help='Comma-separated list of dataset names to process using names from the datasets_json_path file.  If not specified, all datasets in the datasets_json_path will be processed.',
     )
     data_group.add_argument(
         '--out_dir',
@@ -502,7 +526,7 @@ def main():
     args = parser.parse_args()
 
     dataset_meta_info = load_evalset_config(args.datasets_json_path)
-    datasets = list(dataset_meta_info.keys())
+    datasets = filter_datasets(dataset_meta_info, args.datasets)
 
     logging.info(f"Loaded {len(datasets)} datasets: {', '.join(datasets)}")
 
@@ -585,6 +609,7 @@ def main():
                 inference_config=inference_config,
                 eval_config=eval_config,
                 dataset_meta_info=dataset_meta_info,
+                datasets=datasets,
                 out_dir=args.out_dir,
                 num_repeats=args.num_repeats,
                 confidence_level=args.confidence_level,