move config parsing logic to own file, consider whether to find an off-the-shelf solution at future date

setup.py

@@ -10,7 +10,7 @@ setup(
       'dream = dalle2_pytorch.cli:dream'
     ],
   },
-  version = '0.3.7',
+  version = '0.3.8',
   license='MIT',
   description = 'DALL-E 2',
   author = 'Phil Wang',

train_decoder.py

@@ -2,12 +2,11 @@ from dalle2_pytorch import Unet, Decoder
 from dalle2_pytorch.trainer import DecoderTrainer, print_ribbon
 from dalle2_pytorch.dataloaders import create_image_embedding_dataloader
 from dalle2_pytorch.trackers import WandbTracker, ConsoleTracker
+from dalle2_pytorch.train_configs import TrainDecoderConfig
 from dalle2_pytorch.utils import Timer
 
-from configs.decoder_defaults import default_config, ConfigField
 import json
 import torchvision
-from torchvision import transforms as T
 import torch
 from torchmetrics.image.fid import FrechetInceptionDistance
 from torchmetrics.image.inception import InceptionScore
@@ -440,67 +439,6 @@ def initialize_training(config):
         **config["train"],
     )
 
-
-class TrainDecoderConfig:
-    def __init__(self, config):
-        self.config = self.map_config(config, default_config)
-
-    def map_config(self, config, defaults):
-        """
-        Returns a dictionary containing all config options in the union of config and defaults.
-        If the config value is an array, apply the default value to each element.
-        If the default values dict has a value of ConfigField.REQUIRED for a key, it is required and a runtime error should be thrown if a value is not supplied from config
-        """
-        def _check_option(option, option_config, option_defaults):
-            for key, value in option_defaults.items():
-                if key not in option_config:
-                    if value == ConfigField.REQUIRED:
-                        raise RuntimeError("Required config value '{}' of option '{}' not supplied".format(key, option))
-                    option_config[key] = value
-        
-        for key, value in defaults.items():
-            if key not in config:
-                # Then they did not pass in one of the main configs. If the default is an array or object, then we can fill it in. If is a required object, we must error
-                if value == ConfigField.REQUIRED:
-                    raise RuntimeError("Required config value '{}' not supplied".format(key))
-                elif isinstance(value, dict):
-                    config[key] = {}
-                elif isinstance(value, list):
-                    config[key] = [{}]
-            # Config[key] is now either a dict, list of dicts, or an object that cannot be checked. 
-            # If it is a list, then we need to check each element
-            if isinstance(value, list):
-                assert isinstance(config[key], list)
-                for element in config[key]:
-                    _check_option(key, element, value[0])
-            elif isinstance(value, dict):
-                _check_option(key, config[key], value)
-            # This object does not support checking
-        return config
-
-    def get_preprocessing(self):
-        """
-        Takes the preprocessing dictionary and converts it to a composition of torchvision transforms
-        """
-        def _get_transformation(transformation_name, **kwargs):
-            if transformation_name == "RandomResizedCrop":
-                return T.RandomResizedCrop(**kwargs)
-            elif transformation_name == "RandomHorizontalFlip":
-                return T.RandomHorizontalFlip()
-            elif transformation_name == "ToTensor":
-                return T.ToTensor()
-        
-        transformations = []
-        for transformation_name, transformation_kwargs in self.config["data"]["preprocessing"].items():
-            if isinstance(transformation_kwargs, dict):
-                transformations.append(_get_transformation(transformation_name, **transformation_kwargs))
-            else:
-                transformations.append(_get_transformation(transformation_name))
-        return T.Compose(transformations)
-    
-    def __getitem__(self, key):
-        return self.config[key]
-
 # Create a simple click command line interface to load the config and start the training
 @click.command()
 @click.option("--config_file", default="./train_decoder_config.json", help="Path to config file")