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from detectron2.layers import ShapeSpec
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from detectron2.utils.registry import Registry
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from .backbone import Backbone
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BACKBONE_REGISTRY = Registry("BACKBONE")
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BACKBONE_REGISTRY.__doc__ = """
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Registry for backbones, which extract feature maps from images
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The registered object must be a callable that accepts two arguments:
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1. A :class:`detectron2.config.CfgNode`
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2. A :class:`detectron2.layers.ShapeSpec`, which contains the input shape specification.
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Registered object must return instance of :class:`Backbone`.
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"""
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def build_backbone(cfg, input_shape=None):
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"""
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Build a backbone from `cfg.MODEL.BACKBONE.NAME`.
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Returns:
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an instance of :class:`Backbone`
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"""
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if input_shape is None:
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input_shape = ShapeSpec(channels=len(cfg.MODEL.PIXEL_MEAN))
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backbone_name = cfg.MODEL.BACKBONE.NAME
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backbone = BACKBONE_REGISTRY.get(backbone_name)(cfg, input_shape)
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assert isinstance(backbone, Backbone)
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return backbone
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