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import inspect
import platform
from .registry import PLUGIN_LAYERS
if platform.system() == 'Windows':
import regex as re
else:
import re
def infer_abbr(class_type):
"""Infer abbreviation from the class name.
This method will infer the abbreviation to map class types to
abbreviations.
Rule 1: If the class has the property "abbr", return the property.
Rule 2: Otherwise, the abbreviation falls back to snake case of class
name, e.g. the abbreviation of ``FancyBlock`` will be ``fancy_block``.
Args:
class_type (type): The norm layer type.
Returns:
str: The inferred abbreviation.
"""
def camel2snack(word):
"""Convert camel case word into snack case.
Modified from `inflection lib
<https://inflection.readthedocs.io/en/latest/#inflection.underscore>`_.
Example::
>>> camel2snack("FancyBlock")
'fancy_block'
"""
word = re.sub(r'([A-Z]+)([A-Z][a-z])', r'\1_\2', word)
word = re.sub(r'([a-z\d])([A-Z])', r'\1_\2', word)
word = word.replace('-', '_')
return word.lower()
if not inspect.isclass(class_type):
raise TypeError(
f'class_type must be a type, but got {type(class_type)}')
if hasattr(class_type, '_abbr_'):
return class_type._abbr_
else:
return camel2snack(class_type.__name__)
def build_plugin_layer(cfg, postfix='', **kwargs):
"""Build plugin layer.
Args:
cfg (None or dict): cfg should contain:
type (str): identify plugin layer type.
layer args: args needed to instantiate a plugin layer.
postfix (int, str): appended into norm abbreviation to
create named layer. Default: ''.
Returns:
tuple[str, nn.Module]:
name (str): abbreviation + postfix
layer (nn.Module): created plugin layer
"""
if not isinstance(cfg, dict):
raise TypeError('cfg must be a dict')
if 'type' not in cfg:
raise KeyError('the cfg dict must contain the key "type"')
cfg_ = cfg.copy()
layer_type = cfg_.pop('type')
if layer_type not in PLUGIN_LAYERS:
raise KeyError(f'Unrecognized plugin type {layer_type}')
plugin_layer = PLUGIN_LAYERS.get(layer_type)
abbr = infer_abbr(plugin_layer)
assert isinstance(postfix, (int, str))
name = abbr + str(postfix)
layer = plugin_layer(**kwargs, **cfg_)
return name, layer
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