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| #!/usr/bin/env python3 | |
| # Copyright (c) Facebook, Inc. and its affiliates. All Rights Reserved. | |
| import torch | |
| from .box_head.box_head import build_roi_box_head | |
| from .mask_head.mask_head import build_roi_mask_head | |
| class CombinedROIHeads(torch.nn.ModuleDict): | |
| """ | |
| Combines a set of individual heads (for box prediction or masks) into a single | |
| head. | |
| """ | |
| def __init__(self, cfg, heads): | |
| super(CombinedROIHeads, self).__init__(heads) | |
| self.cfg = cfg.clone() | |
| if cfg.MODEL.MASK_ON and cfg.MODEL.ROI_MASK_HEAD.SHARE_BOX_FEATURE_EXTRACTOR: | |
| self.mask.feature_extractor = self.box.feature_extractor | |
| def forward(self, features, proposals, targets=None): | |
| losses = {} | |
| # TODO rename x to roi_box_features, if it doesn't increase memory consumption | |
| x, detections, loss_box = self.box(features, proposals, targets) | |
| losses.update(loss_box) | |
| if self.cfg.MODEL.MASK_ON or self.cfg.SEQUENCE.SEQ_ON: | |
| mask_features = features | |
| # optimization: during training, if we share the feature extractor between | |
| # the box and the mask heads, | |
| # then we can reuse the features already computed | |
| if ( | |
| self.training | |
| and self.cfg.MODEL.ROI_MASK_HEAD.SHARE_BOX_FEATURE_EXTRACTOR | |
| ): | |
| mask_features = x | |
| # During training, self.box() will return | |
| # the unaltered proposals as "detections" | |
| # this makes the API consistent during training and testing | |
| x, detections, loss_mask = self.mask(mask_features, detections, targets) | |
| if loss_mask is not None: | |
| losses.update(loss_mask) | |
| return x, detections, losses | |
| def build_roi_heads(cfg): | |
| # individually create the heads, that will be combined together | |
| # afterwards | |
| roi_heads = [] | |
| if not cfg.MODEL.RPN_ONLY: | |
| roi_heads.append(("box", build_roi_box_head(cfg))) | |
| if cfg.MODEL.MASK_ON or cfg.SEQUENCE.SEQ_ON: | |
| roi_heads.append(("mask", build_roi_mask_head(cfg))) | |
| # combine individual heads in a single module | |
| if roi_heads: | |
| roi_heads = CombinedROIHeads(cfg, roi_heads) | |
| return roi_heads | |