Moved env_vars_connector._defaults_from_env_vars to utilities.argsparse._defaults_from_env_vars (#10501)

Co-authored-by: Carlos Mocholí <[email protected]>

Author: kaushikb11

CHANGELOG.md

@@ -37,6 +37,9 @@ The format is based on [Keep a Changelog](http://keepachangelog.com/en/1.0.0/).
 - Raise `MisconfigurationException` when `enable_progress_bar=False` and a progress bar instance has been passed in the callback list ([#10520](https://github.com/PyTorchLightning/pytorch-lightning/issues/10520))
 
 
+- Moved `trainer.connectors.env_vars_connector._defaults_from_env_vars` to `utilities.argsparse._defaults_from_env_vars` ([#10501](https://github.com/PyTorchLightning/pytorch-lightning/pull/10501))
+
+
 - Changes in `LightningCLI` required for the new major release of jsonargparse v4.0.0 ([#10426](https://github.com/PyTorchLightning/pytorch-lightning/pull/10426))
 
 

pytorch_lightning/trainer/connectors/env_vars_connector.py

@@ -53,7 +53,6 @@
 from pytorch_lightning.trainer.connectors.callback_connector import CallbackConnector
 from pytorch_lightning.trainer.connectors.checkpoint_connector import CheckpointConnector
 from pytorch_lightning.trainer.connectors.data_connector import DataConnector
-from pytorch_lightning.trainer.connectors.env_vars_connector import _defaults_from_env_vars
 from pytorch_lightning.trainer.connectors.logger_connector import LoggerConnector
 from pytorch_lightning.trainer.connectors.logger_connector.result import ResultCollection
 from pytorch_lightning.trainer.connectors.signal_connector import SignalConnector
@@ -75,6 +74,7 @@
     rank_zero_warn,
 )
 from pytorch_lightning.utilities.argparse import (
+    _defaults_from_env_vars,
     add_argparse_args,
     from_argparse_args,
     parse_argparser,

pytorch_lightning/trainer/trainer.py

@@ -16,6 +16,7 @@
 from abc import ABC
 from argparse import _ArgumentGroup, ArgumentParser, Namespace
 from contextlib import suppress
+from functools import wraps
 from typing import Any, Callable, Dict, List, Tuple, Type, Union
 
 import pytorch_lightning as pl
@@ -312,3 +313,22 @@ def _precision_allowed_type(x: Union[int, str]) -> Union[int, str]:
         return int(x)
     except ValueError:
         return x
+
+
+def _defaults_from_env_vars(fn: Callable) -> Callable:
+    @wraps(fn)
+    def insert_env_defaults(self: Any, *args: Any, **kwargs: Any) -> Any:
+        cls = self.__class__  # get the class
+        if args:  # in case any args passed move them to kwargs
+            # parse only the argument names
+            cls_arg_names = [arg[0] for arg in get_init_arguments_and_types(cls)]
+            # convert args to kwargs
+            kwargs.update(dict(zip(cls_arg_names, args)))
+        env_variables = vars(parse_env_variables(cls))
+        # update the kwargs by env variables
+        kwargs = dict(list(env_variables.items()) + list(kwargs.items()))
+
+        # all args were already moved to kwargs
+        return fn(self, **kwargs)
+
+    return insert_env_defaults