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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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