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# Copyright (c) OpenMMLab. All rights reserved.
from typing import List
import torch
import torch.nn.functional as F
from mmcv.cnn import build_norm_layer
from mmcv.cnn.bricks.transformer import FFN, MultiheadAttention
from mmengine.model import BaseModel
from torch import Tensor, nn
from mmaction.registry import MODELS
from mmaction.utils import OptConfigType
from .utils import (batch_iou, bbox_se_transform_batch, bbox_se_transform_inv,
bbox_xw_transform_batch, bbox_xw_transform_inv,
post_processing)
class LGTE(BaseModel):
"""Local-Global Temporal Encoder (LGTE)
Args:
input_dim (int): Input feature dimension.
dropout (float): the dropout rate for the residual branch of
self-attention and ffn.
temporal_dim (int): Total frames selected for each video.
Defaults to 100.
window_size (int): the window size for Local Temporal Encoder.
Defaults to 9.
init_cfg (dict or ConfigDict, optional): The Config for
initialization. Defaults to None.
"""
def __init__(self,
input_dim: int,
dropout: float,
temporal_dim: int = 100,
window_size: int = 9,
num_heads: int = 8,
init_cfg: OptConfigType = None,
**kwargs) -> None:
super(LGTE, self).__init__(init_cfg)
self.atten = MultiheadAttention(
embed_dims=input_dim,
num_heads=num_heads,
proj_drop=dropout,
attn_drop=0.1)
self.ffn = FFN(
embed_dims=input_dim, feedforward_channels=256, ffn_drop=dropout)
norm_cfg = dict(type='LN', eps=1e-6)
self.norm1 = build_norm_layer(norm_cfg, input_dim)[1]
self.norm2 = build_norm_layer(norm_cfg, input_dim)[1]
mask = self._mask_matrix(num_heads, temporal_dim, window_size)
self.register_buffer('mask', mask)
def forward(self, x: Tensor) -> Tensor:
"""Forward call for LGTE.
Args:
x (torch.Tensor): The input tensor with shape (B, C, L)
"""
x = x.permute(2, 0, 1)
mask = self.mask.repeat(x.size(1), 1, 1, 1)
L = x.shape[0]
x = self.atten(x, attn_mask=mask.reshape(-1, L, L))
x = self.norm1(x)
x = self.ffn(x)
x = self.norm2(x)
x = x.permute(1, 2, 0)
return x
@staticmethod
def _mask_matrix(num_heads: int, temporal_dim: int,
window_size: int) -> Tensor:
mask = torch.zeros(num_heads, temporal_dim, temporal_dim)
index = torch.arange(temporal_dim)
for i in range(num_heads // 2):
for j in range(temporal_dim):
ignored = (index - j).abs() > window_size / 2
mask[i, j] = ignored
return mask.unsqueeze(0).bool()
def StartEndRegressor(sample_num: int, feat_dim: int) -> nn.Module:
"""Start and End Regressor in the Temporal Boundary Regressor.
Args:
sample_num (int): number of samples for the start & end.
feat_dim (int): feature dimension.
Returns:
A pytorch module that works as the start and end regressor. The input
of the module should have a shape of (B, feat_dim * 2, sample_num).
"""
hidden_dim = 128
regressor = nn.Sequential(
nn.Conv1d(
feat_dim * 2,
hidden_dim * 2,
kernel_size=3,
padding=1,
groups=8,
stride=2), nn.ReLU(inplace=True),
nn.Conv1d(
hidden_dim * 2,
hidden_dim * 2,
kernel_size=3,
padding=1,
groups=8,
stride=2), nn.ReLU(inplace=True),
nn.Conv1d(hidden_dim * 2, 2, kernel_size=sample_num // 4, groups=2),
nn.Flatten())
return regressor
def CenterWidthRegressor(temporal_len: int, feat_dim: int) -> nn.Module:
"""Center Width in the Temporal Boundary Regressor.
Args:
temporal_len (int): temporal dimension of the inputs.
feat_dim (int): feature dimension.
Returns:
A pytorch module that works as the start and end regressor. The input
of the module should have a shape of (B, feat_dim, temporal_len).
"""
hidden_dim = 512
regressor = nn.Sequential(
nn.Conv1d(
feat_dim, hidden_dim, kernel_size=3, padding=1, groups=4,
stride=2), nn.ReLU(inplace=True),
nn.Conv1d(
hidden_dim,
hidden_dim,
kernel_size=3,
padding=1,
groups=4,
stride=2), nn.ReLU(inplace=True),
nn.Conv1d(
hidden_dim, hidden_dim, kernel_size=temporal_len // 4, groups=4),
nn.ReLU(inplace=True), nn.Conv1d(hidden_dim, 3, kernel_size=1))
return regressor
class TemporalTransform:
"""Temporal Transform to sample temporal features."""
def __init__(self, prop_boundary_ratio: float, action_sample_num: int,
se_sample_num: int, temporal_interval: int):
super(TemporalTransform, self).__init__()
self.temporal_interval = temporal_interval
self.prop_boundary_ratio = prop_boundary_ratio
self.action_sample_num = action_sample_num
self.se_sample_num = se_sample_num
def __call__(self, segments: Tensor, features: Tensor) -> List[Tensor]:
s_len = segments[:, 1] - segments[:, 0]
starts_segments = [
segments[:, 0] - self.prop_boundary_ratio * s_len, segments[:, 0]
]
starts_segments = torch.stack(starts_segments, dim=1)
ends_segments = [
segments[:, 1], segments[:, 1] + self.prop_boundary_ratio * s_len
]
ends_segments = torch.stack(ends_segments, dim=1)
starts_feature = self._sample_one_temporal(starts_segments,
self.se_sample_num,
features)
ends_feature = self._sample_one_temporal(ends_segments,
self.se_sample_num, features)
actions_feature = self._sample_one_temporal(segments,
self.action_sample_num,
features)
return starts_feature, actions_feature, ends_feature
def _sample_one_temporal(self, segments: Tensor, out_len: int,
features: Tensor) -> Tensor:
segments = segments.clamp(0, 1) * 2 - 1
theta = segments.new_zeros((features.size(0), 2, 3))
theta[:, 1, 1] = 1.0
theta[:, 0, 0] = (segments[:, 1] - segments[:, 0]) / 2.0
theta[:, 0, 2] = (segments[:, 1] + segments[:, 0]) / 2.0
size = torch.Size((*features.shape[:2], 1, out_len))
grid = F.affine_grid(theta, size)
stn_feature = F.grid_sample(features.unsqueeze(2), grid)
stn_feature = stn_feature.view(*features.shape[:2], out_len)
return stn_feature
class TBR(BaseModel):
"""Temporal Boundary Regressor (TBR)"""
def __init__(self,
se_sample_num: int,
action_sample_num: int,
temporal_dim: int,
prop_boundary_ratio: float = 0.5,
init_cfg: OptConfigType = None,
**kwargs) -> None:
super(TBR, self).__init__(init_cfg)
hidden_dim = 512
self.reg1se = StartEndRegressor(se_sample_num, hidden_dim)
temporal_len = se_sample_num * 2 + action_sample_num
self.reg1xw = CenterWidthRegressor(temporal_len, hidden_dim)
self.ttn = TemporalTransform(prop_boundary_ratio, action_sample_num,
se_sample_num, temporal_dim)
def forward(self, proposals: Tensor, features: Tensor, gt_boxes: Tensor,
iou_thres: float, training: bool) -> tuple:
proposals1 = proposals[:, :2]
starts_feat1, actions_feat1, ends_feat1 = self.ttn(
proposals1, features)
reg1se = self.reg1se(torch.cat([starts_feat1, ends_feat1], dim=1))
features1xw = torch.cat([starts_feat1, actions_feat1, ends_feat1],
dim=2)
reg1xw = self.reg1xw(features1xw).squeeze(2)
preds_iou1 = reg1xw[:, 2].sigmoid()
reg1xw = reg1xw[:, :2]
if training:
proposals2xw = bbox_xw_transform_inv(proposals1, reg1xw, 0.1, 0.2)
proposals2se = bbox_se_transform_inv(proposals1, reg1se, 1.0)
iou1 = batch_iou(proposals1, gt_boxes)
targets1se = bbox_se_transform_batch(proposals1, gt_boxes)
targets1xw = bbox_xw_transform_batch(proposals1, gt_boxes)
rloss1se = self.regress_loss(reg1se, targets1se, iou1, iou_thres)
rloss1xw = self.regress_loss(reg1xw, targets1xw, iou1, iou_thres)
rloss1 = rloss1se + rloss1xw
iloss1 = self.iou_loss(preds_iou1, iou1, iou_thres=iou_thres)
else:
proposals2xw = bbox_xw_transform_inv(proposals1, reg1xw, 0.1, 0.2)
proposals2se = bbox_se_transform_inv(proposals1, reg1se, 0.2)
rloss1 = iloss1 = 0
proposals2 = (proposals2se + proposals2xw) / 2.0
proposals2 = torch.clamp(proposals2, min=0.)
return preds_iou1, proposals2, rloss1, iloss1
def regress_loss(self, regression, targets, iou_with_gt, iou_thres):
weight = (iou_with_gt >= iou_thres).float().unsqueeze(1)
reg_loss = F.smooth_l1_loss(regression, targets, reduction='none')
if weight.sum() > 0:
reg_loss = (weight * reg_loss).sum() / weight.sum()
else:
reg_loss = (weight * reg_loss).sum()
return reg_loss
def iou_loss(self, preds_iou, match_iou, iou_thres):
preds_iou = preds_iou.view(-1)
u_hmask = (match_iou > iou_thres).float()
u_mmask = ((match_iou <= iou_thres) & (match_iou > 0.3)).float()
u_lmask = (match_iou <= 0.3).float()
num_h, num_m, num_l = u_hmask.sum(), u_mmask.sum(), u_lmask.sum()
bs, device = u_hmask.size()[0], u_hmask.device
r_m = min(num_h / num_m, 1)
u_smmask = torch.rand(bs, device=device) * u_mmask
u_smmask = (u_smmask > (1. - r_m)).float()
r_l = min(num_h / num_l, 1)
u_slmask = torch.rand(bs, device=device) * u_lmask
u_slmask = (u_slmask > (1. - r_l)).float()
iou_weights = u_hmask + u_smmask + u_slmask
iou_loss = F.smooth_l1_loss(preds_iou, match_iou, reduction='none')
if iou_weights.sum() > 0:
iou_loss = (iou_loss * iou_weights).sum() / iou_weights.sum()
else:
iou_loss = (iou_loss * iou_weights).sum()
return iou_loss
@MODELS.register_module()
class TCANet(BaseModel):
"""Temporal Context Aggregation Network.
Please refer `Temporal Context Aggregation Network for Temporal Action
Proposal Refinement <https://arxiv.org/abs/2103.13141>`_.
Code Reference:
https://github.com/qinzhi-0110/Temporal-Context-Aggregation-Network-Pytorch
"""
def __init__(self,
feat_dim: int = 2304,
se_sample_num: int = 32,
action_sample_num: int = 64,
temporal_dim: int = 100,
window_size: int = 9,
lgte_num: int = 2,
soft_nms_alpha: float = 0.4,
soft_nms_low_threshold: float = 0.0,
soft_nms_high_threshold: float = 0.0,
post_process_top_k: int = 100,
feature_extraction_interval: int = 16,
init_cfg: OptConfigType = None,
**kwargs) -> None:
super(TCANet, self).__init__(init_cfg)
self.soft_nms_alpha = soft_nms_alpha
self.soft_nms_low_threshold = soft_nms_low_threshold
self.soft_nms_high_threshold = soft_nms_high_threshold
self.feature_extraction_interval = feature_extraction_interval
self.post_process_top_k = post_process_top_k
hidden_dim = 512
self.x_1d_b_f = nn.Sequential(
nn.Conv1d(
feat_dim, hidden_dim, kernel_size=3, padding=1, groups=4),
nn.ReLU(inplace=True),
nn.Conv1d(
hidden_dim, hidden_dim, kernel_size=3, padding=1, groups=4),
nn.ReLU(inplace=True),
)
for i in 1, 2, 3:
tbr = TBR(
se_sample_num=se_sample_num,
action_sample_num=action_sample_num,
temporal_dim=temporal_dim,
init_cfg=init_cfg,
**kwargs)
setattr(self, f'tbr{i}', tbr)
self.lgtes = nn.ModuleList([
LGTE(
input_dim=hidden_dim,
dropout=0.1,
temporal_dim=temporal_dim,
window_size=window_size,
init_cfg=init_cfg,
**kwargs) for i in range(lgte_num)
])
def forward(self, inputs, data_samples, mode, **kwargs):
"""The unified entry for a forward process in both training and test.
The method should accept three modes:
- ``tensor``: Forward the whole network and return tensor or tuple of
tensor without any post-processing, same as a common nn.Module.
- ``predict``: Forward and return the predictions, which are fully
processed to a list of :obj:`ActionDataSample`.
- ``loss``: Forward and return a dict of losses according to the given
inputs and data samples.
Note that this method doesn't handle neither back propagation nor
optimizer updating, which are done in the :meth:`train_step`.
Args:
inputs (Tensor): The input tensor with shape
(N, C, ...) in general.
data_samples (List[:obj:`ActionDataSample`], optional): The
annotation data of every samples. Defaults to None.
mode (str): Return what kind of value. Defaults to ``tensor``.
Returns:
The return type depends on ``mode``.
- If ``mode="tensor"``, return a tensor or a tuple of tensor.
- If ``mode="predict"``, return a list of ``ActionDataSample``.
- If ``mode="loss"``, return a dict of tensor.
"""
if not isinstance(input, Tensor):
inputs = torch.stack(inputs)
if mode == 'tensor':
return self._forward(inputs, **kwargs)
if mode == 'predict':
return self.predict(inputs, data_samples, **kwargs)
elif mode == 'loss':
return self.loss(inputs, data_samples, **kwargs)
else:
raise RuntimeError(f'Invalid mode "{mode}". '
'Only supports loss, predict and tensor mode')
def _forward(self, x):
"""Define the computation performed at every call.
Args:
x (torch.Tensor): The input data.
Returns:
torch.Tensor: The output of the module.
"""
x = self.x_1d_b_f(x)
for layer in self.lgtes:
x = layer(x)
return x
def loss(self, batch_inputs, batch_data_samples, **kwargs):
features = self._forward(batch_inputs)
proposals_ = [
sample.proposals['proposals'] for sample in batch_data_samples
]
batch_size = len(proposals_)
proposals_num = max([_.shape[0] for _ in proposals_])
proposals = torch.zeros((batch_size, proposals_num, 3),
device=features.device)
for i, proposal in enumerate(proposals_):
proposals[i, :proposal.shape[0]] = proposal
gt_boxes_ = [
sample.gt_instances['gt_bbox'] for sample in batch_data_samples
]
gt_boxes = torch.zeros((batch_size, proposals_num, 2),
device=features.device)
for i, gt_box in enumerate(gt_boxes_):
L = gt_box.shape[0]
if L <= proposals_num:
gt_boxes[i, :L] = gt_box
else:
random_index = torch.randperm(L)[:proposals_num]
gt_boxes[i] = gt_box[random_index]
for i in range(batch_size):
proposals[i, :, 2] = i
proposals = proposals.view(batch_size * proposals_num, 3)
proposals_select = proposals[:, 0:2].sum(dim=1) > 0
proposals = proposals[proposals_select, :]
features = features[proposals[:, 2].long()]
gt_boxes = gt_boxes.view(batch_size * proposals_num, 2)
gt_boxes = gt_boxes[proposals_select, :]
_, proposals1, rloss1, iloss1 = self.tbr1(proposals, features,
gt_boxes, 0.5, True)
_, proposals2, rloss2, iloss2 = self.tbr2(proposals1, features,
gt_boxes, 0.6, True)
_, _, rloss3, iloss3 = self.tbr3(proposals2, features, gt_boxes, 0.7,
True)
loss_dict = dict(
rloss1=rloss1,
rloss2=rloss2,
rloss3=rloss3,
iloss1=iloss1,
iloss2=iloss2,
iloss3=iloss3)
return loss_dict
def predict(self, batch_inputs, batch_data_samples, **kwargs):
features = self._forward(batch_inputs)
proposals_ = [
sample.proposals['proposals'] for sample in batch_data_samples
]
batch_size = len(proposals_)
proposals_num = max([_.shape[0] for _ in proposals_])
proposals = torch.zeros((batch_size, proposals_num, 3),
device=features.device)
for i, proposal in enumerate(proposals_):
proposals[i, :proposal.shape[0]] = proposal
scores = proposals[:, :, 2]
for i in range(batch_size):
proposals[i, :, 2] = i
proposals = proposals.view(batch_size * proposals_num, 3)
proposals_select = proposals[:, 0:2].sum(dim=1) > 0
proposals = proposals[proposals_select, :]
scores = scores.view(-1)[proposals_select]
features = features[proposals[:, 2].long()]
preds_iou1, proposals1 = self.tbr1(proposals, features, None, 0.5,
False)[:2]
preds_iou2, proposals2 = self.tbr2(proposals1, features, None, 0.6,
False)[:2]
preds_iou3, proposals3 = self.tbr3(proposals2, features, None, 0.7,
False)[:2]
all_proposals = []
# all_proposals = [proposals]
all_proposals += [
torch.cat([proposals1, (scores * preds_iou1).view(-1, 1)], dim=1)
]
all_proposals += [
torch.cat([proposals2, (scores * preds_iou2).view(-1, 1)], dim=1)
]
all_proposals += [
torch.cat([proposals3, (scores * preds_iou3).view(-1, 1)], dim=1)
]
all_proposals = torch.cat(all_proposals, dim=0).cpu().numpy()
video_info = batch_data_samples[0].metainfo
proposal_list = post_processing(all_proposals, video_info,
self.soft_nms_alpha,
self.soft_nms_low_threshold,
self.soft_nms_high_threshold,
self.post_process_top_k,
self.feature_extraction_interval)
output = [
dict(
video_name=video_info['video_name'],
proposal_list=proposal_list)
]
return output
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