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| # Copyright (c) Facebook, Inc. and its affiliates. | |
| from typing import Any | |
| import torch | |
| from torch.nn import functional as F | |
| from detectron2.config import CfgNode | |
| from detectron2.layers import ConvTranspose2d | |
| from densepose.modeling.confidence import DensePoseConfidenceModelConfig | |
| from densepose.modeling.utils import initialize_module_params | |
| from densepose.structures import decorate_cse_predictor_output_class_with_confidences | |
| class DensePoseEmbeddingConfidencePredictorMixin: | |
| """ | |
| Predictor contains the last layers of a DensePose model that take DensePose head | |
| outputs as an input and produce model outputs. Confidence predictor mixin is used | |
| to generate confidences for coarse segmentation estimated by some | |
| base predictor. Several assumptions need to hold for the base predictor: | |
| 1) the `forward` method must return CSE DensePose head outputs, | |
| tensor of shape [N, D, H, W] | |
| 2) `interp2d` method must be defined to perform bilinear interpolation; | |
| the same method is typically used for masks and confidences | |
| Confidence predictor mixin provides confidence estimates, as described in: | |
| N. Neverova et al., Correlated Uncertainty for Learning Dense Correspondences | |
| from Noisy Labels, NeurIPS 2019 | |
| A. Sanakoyeu et al., Transferring Dense Pose to Proximal Animal Classes, CVPR 2020 | |
| """ | |
| def __init__(self, cfg: CfgNode, input_channels: int): | |
| """ | |
| Initialize confidence predictor using configuration options. | |
| Args: | |
| cfg (CfgNode): configuration options | |
| input_channels (int): number of input channels | |
| """ | |
| # we rely on base predictor to call nn.Module.__init__ | |
| super().__init__(cfg, input_channels) # pyre-ignore[19] | |
| self.confidence_model_cfg = DensePoseConfidenceModelConfig.from_cfg(cfg) | |
| self._initialize_confidence_estimation_layers(cfg, input_channels) | |
| self._registry = {} | |
| initialize_module_params(self) # pyre-ignore[6] | |
| def _initialize_confidence_estimation_layers(self, cfg: CfgNode, dim_in: int): | |
| """ | |
| Initialize confidence estimation layers based on configuration options | |
| Args: | |
| cfg (CfgNode): configuration options | |
| dim_in (int): number of input channels | |
| """ | |
| kernel_size = cfg.MODEL.ROI_DENSEPOSE_HEAD.DECONV_KERNEL | |
| if self.confidence_model_cfg.segm_confidence.enabled: | |
| self.coarse_segm_confidence_lowres = ConvTranspose2d( # pyre-ignore[16] | |
| dim_in, 1, kernel_size, stride=2, padding=int(kernel_size / 2 - 1) | |
| ) | |
| def forward(self, head_outputs: torch.Tensor): | |
| """ | |
| Perform forward operation on head outputs used as inputs for the predictor. | |
| Calls forward method from the base predictor and uses its outputs to compute | |
| confidences. | |
| Args: | |
| head_outputs (Tensor): head outputs used as predictor inputs | |
| Return: | |
| An instance of outputs with confidences, | |
| see `decorate_cse_predictor_output_class_with_confidences` | |
| """ | |
| # assuming base class returns SIUV estimates in its first result | |
| base_predictor_outputs = super().forward(head_outputs) # pyre-ignore[16] | |
| # create output instance by extending base predictor outputs: | |
| output = self._create_output_instance(base_predictor_outputs) | |
| if self.confidence_model_cfg.segm_confidence.enabled: | |
| # base predictor outputs are assumed to have `coarse_segm` attribute | |
| # base predictor is assumed to define `interp2d` method for bilinear interpolation | |
| output.coarse_segm_confidence = ( | |
| F.softplus( | |
| self.interp2d( # pyre-ignore[16] | |
| self.coarse_segm_confidence_lowres(head_outputs) # pyre-ignore[16] | |
| ) | |
| ) | |
| + self.confidence_model_cfg.segm_confidence.epsilon | |
| ) | |
| output.coarse_segm = base_predictor_outputs.coarse_segm * torch.repeat_interleave( | |
| output.coarse_segm_confidence, base_predictor_outputs.coarse_segm.shape[1], dim=1 | |
| ) | |
| return output | |
| def _create_output_instance(self, base_predictor_outputs: Any): | |
| """ | |
| Create an instance of predictor outputs by copying the outputs from the | |
| base predictor and initializing confidence | |
| Args: | |
| base_predictor_outputs: an instance of base predictor outputs | |
| (the outputs type is assumed to be a dataclass) | |
| Return: | |
| An instance of outputs with confidences | |
| """ | |
| PredictorOutput = decorate_cse_predictor_output_class_with_confidences( | |
| type(base_predictor_outputs) # pyre-ignore[6] | |
| ) | |
| # base_predictor_outputs is assumed to be a dataclass | |
| # reassign all the fields from base_predictor_outputs (no deep copy!), add new fields | |
| output = PredictorOutput( | |
| **base_predictor_outputs.__dict__, | |
| coarse_segm_confidence=None, | |
| ) | |
| return output | |