Refactor cli and runner. Implement reserved config keys. Add feature to pass args to Trainer's methods.

docs/basics/projects.md

@@ -136,9 +136,9 @@ In the above example, the path of the dataset is `/home/user/project/my_xray_dat
 
 === "Terminal"
     ```
-    lighter fit --config_file xray.yaml
+    lighter fit --config xray.yaml
     ```
 
 </div>   
 
-1. Make sure to put an `__init__.py` file in this directory. Remember this is needed for an importable python module
+1. Make sure to put an `__init__.py` file in this directory. Remember this is needed for an importable python module

docs/basics/quickstart.md

@@ -129,8 +129,8 @@ We just combine the Trainer and LighterSystem into a single YAML and run the com
     ```
 === "Terminal"
     ```
-    lighter fit --config_file cifar10.yaml
+    lighter fit --config cifar10.yaml
     ```
 
 
-Congratulations!! You have run your first training example with Lighter.
+Congratulations!! You have run your first training example with Lighter.

docs/index.md

@@ -99,7 +99,7 @@ Say goodbye to messy scripts and notebooks. Lighter is here to help you organize
     <div style="width: 49%;">
         <h3 style="text-align: center">Lighter</h3>
         ```bash title="Terminal"
-        lighter fit --config_file cifar10.yaml
+        lighter fit --config cifar10.yaml
         ```
         ```yaml title="cifar10.yaml"
         trainer:

lighter/utils/logging.py

@@ -2,7 +2,6 @@
 SUPPRESSED_MODULES = [
     "fire",
     "monai.bundle",
-    "lighter.utils.cli",
     "lighter.utils.runner",
     "pytorch_lightning.trainer",
     "lightning_utilities",

lighter/utils/runner.py

@@ -1,70 +1,111 @@
-from typing import Any, Dict
+from typing import Any
 
+from functools import partial
+
+import fire
 from monai.bundle.config_parser import ConfigParser
 from pytorch_lightning import seed_everything
 
+from lighter.system import LighterSystem
 from lighter.utils.dynamic_imports import import_module_from_path
 
+CONFIG_STRUCTURE = {"project": None, "system": {}, "trainer": {}, "args": {}, "vars": {}}
+TRAINER_METHOD_NAMES = ["fit", "validate", "test", "predict", "lr_find", "scale_batch_size"]
+
+
+def cli() -> None:
+    """Defines the command line interface for running lightning trainer's methods."""
+    commands = {method: partial(run, method) for method in TRAINER_METHOD_NAMES}
+    fire.Fire(commands)
+
 
 def parse_config(**kwargs) -> ConfigParser:
     """
     Parses configuration files and updates the provided parser
     with given keyword arguments. Returns an updated parser object.
 
     Args:
-        **kwargs (dict): Keyword arguments containing configuration data.
-            config_file (str): Path to the main configuration file.
-            args_file (str, optional): Path to secondary configuration file for additional arguments.
-            Additional key-value pairs can also be provided to be added or updated in the parser.
-
+        **kwargs (dict): Keyword arguments containing 'config' and, optionally, config overrides.
     Returns:
-        An instance of ConfigParser with parsed and merged configuration data.
+        An instance of ConfigParser with configuration and overrides merged and parsed.
     """
+    # Ensure a config file is specified.
+    config = kwargs.pop("config", None)
+    if config is None:
+        raise ValueError("'--config' not specified. Please provide a valid configuration file.")
+
+    # Read the config file and update it with overrides.
+    parser = ConfigParser(CONFIG_STRUCTURE, globals=False)
+    parser.read_config(config)
+    parser.update(kwargs)
+    return parser
 
-    # Check that a config file is specified.
-    if "config_file" not in kwargs:
-        raise ValueError("--config_file not specified. Exiting.")
 
-    # Parse the config file(s).
-    parser = ConfigParser()
-    parser.read_config(kwargs.pop("config_file"))
-    parser.update(pairs=kwargs)
+def validate_config(parser: ConfigParser) -> None:
+    """
+    Validates the configuration parser against predefined structures and allowed method names.
 
-    # Import the project folder as a module, if specified.
-    project = parser.get("project", None)
-    if project is not None:
-        import_module_from_path("project", project)
+    This function checks if the keys in the top-level of the configuration parser are valid according to the
+    CONFIG_STRUCTURE. It also verifies that the 'args' section of the configuration only contains keys that
+    correspond to valid trainer method names as defined in TRAINER_METHOD_NAMES.
 
-    return parser
+    Args:
+        parser (ConfigParser): The configuration parser instance to validate.
+
+    Raises:
+        ValueError: If there are invalid keys in the top-level configuration.
+        ValueError: If there are invalid method names specified in the 'args' section.
+    """
+    # Validate parser keys against structure
+    root_keys = parser.get().keys()
+    invalid_root_keys = set(root_keys) - set(CONFIG_STRUCTURE.keys()) - {"_meta_", "_requires_"}
+    if invalid_root_keys:
+        raise ValueError(f"Invalid top-level config keys: {invalid_root_keys}. Allowed keys: {CONFIG_STRUCTURE.keys()}")
+
+    # Validate that 'args' contains only valid trainer method names.
+    args_keys = parser.get("args").keys()
+    invalid_args_keys = set(args_keys) - set(TRAINER_METHOD_NAMES)
+    if invalid_args_keys:
+        raise ValueError(f"Invalid trainer method in 'args': {invalid_args_keys}. Allowed methods are: {TRAINER_METHOD_NAMES}")
 
 
-def run_trainer_method(method: Dict, **kwargs: Any):
-    """Call monai.bundle.run() on a Trainer method. If a project path
-    is defined in the config file(s), import it.
+def run(method: str, **kwargs: Any):
+    """Run the trainer method.
 
     Args:
-        method (str): name of the Trainer method to run. ["fit", "validate", "test", "predict", "tune"].
-        **kwargs (Any): keyword arguments passed to the `monai.bundle.run` function.
+        method (str): name of the trainer method to run.
+        **kwargs (Any): keyword arguments that include 'config' and specific config overrides passed to `parse_config()`.
     """
-    # Sets the random seed to `PL_GLOBAL_SEED` env variable. If not specified, it picks a random seed.
     seed_everything()
 
-    # Parse the config file(s).
+    # Parse and validate the config.
     parser = parse_config(**kwargs)
+    validate_config(parser)
 
-    # Get trainer and system
-    trainer = parser.get_parsed_content("trainer")
+    # Import the project folder as a module, if specified.
+    project = parser.get_parsed_content("project")
+    if project is not None:
+        import_module_from_path("project", project)
+
+    # Get the main components from the parsed config.
     system = parser.get_parsed_content("system")
+    trainer = parser.get_parsed_content("trainer")
+    trainer_method_args = parser.get_parsed_content(f"args#{method}", default={})
 
+    # Checks
+    if not isinstance(system, LighterSystem):
+        raise ValueError(f"Expected 'system' to be an instance of LighterSystem, got {system.__class__.__name__}.")
+    if not hasattr(trainer, method):
+        raise ValueError(f"{trainer.__class__.__name__} has no method named '{method}'.")
+    if any("dataloaders" in key or "datamodule" in key for key in trainer_method_args):
+        raise ValueError("All dataloaders should be defined as part of the LighterSystem, not passed as method arguments.")
+
+    # Save the config to checkpoints under "hyper_parameters" and log it if a logger is defined.
     config = parser.get()
-    config.pop("_meta_")
-    # Save the config to model checkpoints under the "hyper_parameters" key.
+    config.pop("_meta_")  # MONAI Bundle adds this automatically, remove it.
     system.save_hyperparameters(config)
-    # Log the config.
     if trainer.logger is not None:
         trainer.logger.log_hyperparams(config)
 
-    # Run the Trainer method.
-    if not hasattr(trainer, method):
-        raise ValueError(f"Trainer has no method named {method}.")
-    getattr(trainer, method)(system)
+    # Run the trainer method.
+    getattr(trainer, method)(system, **trainer_method_args)

pyproject.toml

@@ -4,7 +4,7 @@ requires = ["poetry_core>=1.0.0"]
 build-backend = "poetry.core.masonry.api"
 
 [tool.poetry.scripts]
-lighter = "lighter.utils.cli:interface"
+lighter = "lighter.utils.runner:cli"
 
 [tool.poetry]
 name = "project-lighter"

tests/integration/test_cifar.py

@@ -2,13 +2,13 @@
 
 import pytest
 
-from lighter.utils.cli import run_trainer_method
+from lighter.utils.runner import run
 
 test_overrides = "./tests/integration/test_overrides.yaml"
 
 
 @pytest.mark.parametrize(
-    ("method_name", "config_file"),
+    ("method_name", "config"),
     [
         (  # Method name
             "fit",
@@ -18,9 +18,9 @@
     ],
 )
 @pytest.mark.slow
-def test_trainer_method(method_name: str, config_file: str):
+def test_trainer_method(method_name: str, config: str):
     """ """
-    kwargs = {"config_file": config_file, "args_file": test_overrides}
+    kwargs = {"config": [config, test_overrides]}
 
-    func_return = run_trainer_method(method_name, **kwargs)
+    func_return = run(method_name, **kwargs)
     assert func_return is None