git init

basicsr/losses/__init__.py

+import importlib
+from copy import deepcopy
+from os import path as osp
+
+from basicsr.utils import get_root_logger, scandir
+from basicsr.utils.registry import LOSS_REGISTRY
+from .gan_loss import g_path_regularize, gradient_penalty_loss, r1_penalty
+
+__all__ = ['build_loss', 'gradient_penalty_loss', 'r1_penalty', 'g_path_regularize']
+
+# automatically scan and import loss modules for registry
+# scan all the files under the 'losses' folder and collect files ending with '_loss.py'
+loss_folder = osp.dirname(osp.abspath(__file__))
+loss_filenames = [osp.splitext(osp.basename(v))[0] for v in scandir(loss_folder) if v.endswith('_loss.py')]
+# import all the loss modules
+_model_modules = [importlib.import_module(f'basicsr.losses.{file_name}') for file_name in loss_filenames]
+
+
+def build_loss(opt):
+    """Build loss from options.
+
+    Args:
+        opt (dict): Configuration. It must contain:
+            type (str): Model type.
+    """
+    opt = deepcopy(opt)
+    loss_type = opt.pop('type')
+    loss = LOSS_REGISTRY.get(loss_type)(**opt)
+    logger = get_root_logger()
+    logger.info(f'Loss [{loss.__class__.__name__}] is created.')
+    return loss