add --num-threads argument to train cli

changelog/5086.feature.rst

@@ -0,0 +1 @@
+Added a ``--num-threads`` CLI argument that can be passed to ``rasa train`` and will be used to train NLU components.

rasa/cli/arguments/train.py

@@ -20,6 +20,8 @@ def set_train_arguments(parser: argparse.ArgumentParser):
     add_augmentation_param(parser)
     add_debug_plots_param(parser)
 
+    add_num_threads_param(parser)
+
     add_model_name_param(parser)
     add_persist_nlu_data_param(parser)
     add_force_param(parser)
@@ -48,6 +50,8 @@ def set_train_nlu_arguments(parser: argparse.ArgumentParser):
 
     add_nlu_data_param(parser, help_text="File or folder containing your NLU data.")
 
+    add_num_threads_param(parser)
+
     add_model_name_param(parser)
     add_persist_nlu_data_param(parser)
 
@@ -120,6 +124,17 @@ def add_debug_plots_param(
     )
 
 
+def add_num_threads_param(
+    parser: Union[argparse.ArgumentParser, argparse._ActionsContainer]
+):
+    parser.add_argument(
+        "--num-threads",
+        type=int,
+        default=1,
+        help="Maximum amount of threads to use when training.",
+    )
+
+
 def add_model_name_param(parser: argparse.ArgumentParser):
     parser.add_argument(
         "--fixed-model-name",

rasa/cli/train.py

@@ -73,7 +73,8 @@ def train(args: argparse.Namespace) -> Optional[Text]:
         force_training=args.force,
         fixed_model_name=args.fixed_model_name,
         persist_nlu_training_data=args.persist_nlu_data,
-        additional_arguments=extract_additional_arguments(args),
+        core_additional_arguments=extract_core_additional_arguments(args),
+        nlu_additional_arguments=extract_nlu_additional_arguments(args),
     )
 
 
@@ -92,7 +93,7 @@ def train_core(
     story_file = get_validated_path(
         args.stories, "stories", DEFAULT_DATA_PATH, none_is_valid=True
     )
-    additional_arguments = extract_additional_arguments(args)
+    additional_arguments = extract_core_additional_arguments(args)
 
     # Policies might be a list for the compare training. Do normal training
     # if only list item was passed.
@@ -138,10 +139,11 @@ def train_nlu(
         train_path=train_path,
         fixed_model_name=args.fixed_model_name,
         persist_nlu_training_data=args.persist_nlu_data,
+        additional_arguments=extract_nlu_additional_arguments(args),
     )
 
 
-def extract_additional_arguments(args: argparse.Namespace) -> Dict:
+def extract_core_additional_arguments(args: argparse.Namespace) -> Dict:
     arguments = {}
 
     if "augmentation" in args:
@@ -152,6 +154,15 @@ def extract_additional_arguments(args: argparse.Namespace) -> Dict:
     return arguments
 
 
+def extract_nlu_additional_arguments(args: argparse.Namespace) -> Dict:
+    arguments = {}
+
+    if "num_threads" in args:
+        arguments["num_threads"] = args.num_threads
+
+    return arguments
+
+
 def _get_valid_config(
     config: Optional[Text],
     mandatory_keys: List[Text],

rasa/train.py

@@ -28,7 +28,8 @@ def train(
     force_training: bool = False,
     fixed_model_name: Optional[Text] = None,
     persist_nlu_training_data: bool = False,
-    additional_arguments: Optional[Dict] = None,
+    core_additional_arguments: Optional[Dict] = None,
+    nlu_additional_arguments: Optional[Dict] = None,
     loop: Optional[asyncio.AbstractEventLoop] = None,
 ) -> Optional[Text]:
     if loop is None:
@@ -47,7 +48,8 @@ def train(
             force_training=force_training,
             fixed_model_name=fixed_model_name,
             persist_nlu_training_data=persist_nlu_training_data,
-            additional_arguments=additional_arguments,
+            core_additional_arguments=core_additional_arguments,
+            nlu_additional_arguments=nlu_additional_arguments,
         )
     )
 
@@ -60,7 +62,8 @@ async def train_async(
     force_training: bool = False,
     fixed_model_name: Optional[Text] = None,
     persist_nlu_training_data: bool = False,
-    additional_arguments: Optional[Dict] = None,
+    core_additional_arguments: Optional[Dict] = None,
+    nlu_additional_arguments: Optional[Dict] = None,
 ) -> Optional[Text]:
     """Trains a Rasa model (Core and NLU).
 
@@ -73,7 +76,9 @@ async def train_async(
         fixed_model_name: Name of model to be stored.
         persist_nlu_training_data: `True` if the NLU training data should be persisted
                                    with the model.
-        additional_arguments: Additional training parameters.
+        core_additional_arguments: Additional training parameters for core training.
+        nlu_additional_arguments: Additional training parameters forwarded to training
+                                  method of each NLU component.
 
     Returns:
         Path of the trained model archive.
@@ -98,7 +103,8 @@ async def train_async(
             force_training,
             fixed_model_name,
             persist_nlu_training_data,
-            additional_arguments,
+            core_additional_arguments=core_additional_arguments,
+            nlu_additional_arguments=nlu_additional_arguments,
         )
 
 
@@ -122,7 +128,8 @@ async def _train_async_internal(
     force_training: bool,
     fixed_model_name: Optional[Text],
     persist_nlu_training_data: bool,
-    additional_arguments: Optional[Dict],
+    core_additional_arguments: Optional[Dict] = None,
+    nlu_additional_arguments: Optional[Dict] = None,
 ) -> Optional[Text]:
     """Trains a Rasa model (Core and NLU). Use only from `train_async`.
 
@@ -131,10 +138,12 @@ async def _train_async_internal(
         train_path: Directory in which to train the model.
         output_path: Output path.
         force_training: If `True` retrain model even if data has not changed.
+        fixed_model_name: Name of model to be stored.
         persist_nlu_training_data: `True` if the NLU training data should be persisted
                                    with the model.
-        fixed_model_name: Name of model to be stored.
-        additional_arguments: Additional training parameters.
+        core_additional_arguments: Additional training parameters for core training.
+        nlu_additional_arguments: Additional training parameters forwarded to training
+                                  method of each NLU component.
 
     Returns:
         Path of the trained model archive.
@@ -158,6 +167,7 @@ async def _train_async_internal(
             output=output_path,
             fixed_model_name=fixed_model_name,
             persist_nlu_training_data=persist_nlu_training_data,
+            additional_arguments=nlu_additional_arguments,
         )
 
     if nlu_data.is_empty():
@@ -166,7 +176,7 @@ async def _train_async_internal(
             file_importer,
             output=output_path,
             fixed_model_name=fixed_model_name,
-            additional_arguments=additional_arguments,
+            additional_arguments=core_additional_arguments,
         )
 
     new_fingerprint = await model.model_fingerprint(file_importer)
@@ -185,7 +195,8 @@ async def _train_async_internal(
             fingerprint_comparison_result=fingerprint_comparison,
             fixed_model_name=fixed_model_name,
             persist_nlu_training_data=persist_nlu_training_data,
-            additional_arguments=additional_arguments,
+            core_additional_arguments=core_additional_arguments,
+            nlu_additional_arguments=nlu_additional_arguments,
         )
 
         return model.package_model(
@@ -209,7 +220,8 @@ async def _do_training(
     fingerprint_comparison_result: Optional[FingerprintComparisonResult] = None,
     fixed_model_name: Optional[Text] = None,
     persist_nlu_training_data: bool = False,
-    additional_arguments: Optional[Dict] = None,
+    core_additional_arguments: Optional[Dict] = None,
+    nlu_additional_arguments: Optional[Dict] = None,
 ):
     if not fingerprint_comparison_result:
         fingerprint_comparison_result = FingerprintComparisonResult()
@@ -220,7 +232,7 @@ async def _do_training(
             output=output_path,
             train_path=train_path,
             fixed_model_name=fixed_model_name,
-            additional_arguments=additional_arguments,
+            additional_arguments=core_additional_arguments,
         )
     elif fingerprint_comparison_result.should_retrain_nlg():
         print_color(
@@ -243,6 +255,7 @@ async def _do_training(
             train_path=train_path,
             fixed_model_name=fixed_model_name,
             persist_nlu_training_data=persist_nlu_training_data,
+            additional_arguments=nlu_additional_arguments,
         )
     else:
         print_color(
@@ -383,6 +396,7 @@ def train_nlu(
     train_path: Optional[Text] = None,
     fixed_model_name: Optional[Text] = None,
     persist_nlu_training_data: bool = False,
+    additional_arguments: Optional[Dict] = None,
 ) -> Optional[Text]:
     """Trains an NLU model.
 
@@ -395,6 +409,8 @@ def train_nlu(
         fixed_model_name: Name of the model to be stored.
         persist_nlu_training_data: `True` if the NLU training data should be persisted
                                    with the model.
+        additional_arguments: Additional training parameters which will be passed to
+                              the `train` method of each component.
 
 
     Returns:
@@ -412,6 +428,7 @@ def train_nlu(
             train_path,
             fixed_model_name,
             persist_nlu_training_data,
+            additional_arguments,
         )
     )
 
@@ -423,6 +440,7 @@ async def _train_nlu_async(
     train_path: Optional[Text] = None,
     fixed_model_name: Optional[Text] = None,
     persist_nlu_training_data: bool = False,
+    additional_arguments: Optional[Dict] = None,
 ):
     if not nlu_data:
         print_error(
@@ -451,6 +469,7 @@ async def _train_nlu_async(
         train_path=train_path,
         fixed_model_name=fixed_model_name,
         persist_nlu_training_data=persist_nlu_training_data,
+        additional_arguments=additional_arguments,
     )
 
 
@@ -460,11 +479,15 @@ async def _train_nlu_with_validated_data(
     train_path: Optional[Text] = None,
     fixed_model_name: Optional[Text] = None,
     persist_nlu_training_data: bool = False,
+    additional_arguments: Optional[Dict] = None,
 ) -> Optional[Text]:
     """Train NLU with validated training and config data."""
 
     import rasa.nlu.train
 
+    if additional_arguments is None:
+        additional_arguments = {}
+
     with ExitStack() as stack:
         if train_path:
             # If the train path was provided, do nothing on exit.
@@ -480,6 +503,7 @@ async def _train_nlu_with_validated_data(
             _train_path,
             fixed_model_name="nlu",
             persist_nlu_training_data=persist_nlu_training_data,
+            **additional_arguments,
         )
         print_color("NLU model training completed.", color=bcolors.OKBLUE)
 

tests/cli/test_rasa_train.py

@@ -326,6 +326,7 @@ def test_train_help(run):
     help_text = """usage: rasa train [-h] [-v] [-vv] [--quiet] [--data DATA [DATA ...]]
                   [-c CONFIG] [-d DOMAIN] [--out OUT]
                   [--augmentation AUGMENTATION] [--debug-plots]
+                  [--num-threads NUM_THREADS]
                   [--fixed-model-name FIXED_MODEL_NAME] [--persist-nlu-data]
                   [--force]
                   {core,nlu} ..."""
@@ -340,7 +341,8 @@ def test_train_nlu_help(run: Callable[..., RunResult]):
     output = run("train", "nlu", "--help")
 
     help_text = """usage: rasa train nlu [-h] [-v] [-vv] [--quiet] [-c CONFIG] [--out OUT]
-                      [-u NLU] [--fixed-model-name FIXED_MODEL_NAME]
+                      [-u NLU] [--num-threads NUM_THREADS]
+                      [--fixed-model-name FIXED_MODEL_NAME]
                       [--persist-nlu-data]"""
 
     lines = help_text.split("\n")