BasicSR

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