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# Copyright (c) OpenMMLab. All rights reserved.
import math
import numpy as np
import torch
import torch.nn as nn
from mmengine.model import BaseModel
from mmaction.registry import MODELS
from .utils import post_processing, temporal_iop, temporal_iou
@MODELS.register_module()
class BMN(BaseModel):
"""Boundary Matching Network for temporal action proposal generation.
Please refer `BMN: Boundary-Matching Network for Temporal Action Proposal
Generation <https://arxiv.org/abs/1907.09702>`_.
Code Reference https://github.com/JJBOY/BMN-Boundary-Matching-Network
Args:
temporal_dim (int): Total frames selected for each video.
boundary_ratio (float): Ratio for determining video boundaries.
num_samples (int): Number of samples for each proposal.
num_samples_per_bin (int): Number of bin samples for each sample.
feat_dim (int): Feature dimension.
soft_nms_alpha (float): Soft NMS alpha.
soft_nms_low_threshold (float): Soft NMS low threshold.
soft_nms_high_threshold (float): Soft NMS high threshold.
post_process_top_k (int): Top k proposals in post process.
feature_extraction_interval (int):
Interval used in feature extraction. Default: 16.
loss_cls (dict): Config for building loss.
Default: ``dict(type='BMNLoss')``.
hidden_dim_1d (int): Hidden dim for 1d conv. Default: 256.
hidden_dim_2d (int): Hidden dim for 2d conv. Default: 128.
hidden_dim_3d (int): Hidden dim for 3d conv. Default: 512.
"""
def __init__(self,
temporal_dim,
boundary_ratio,
num_samples,
num_samples_per_bin,
feat_dim,
soft_nms_alpha,
soft_nms_low_threshold,
soft_nms_high_threshold,
post_process_top_k,
feature_extraction_interval=16,
loss_cls=dict(type='BMNLoss'),
hidden_dim_1d=256,
hidden_dim_2d=128,
hidden_dim_3d=512):
super().__init__()
self.tscale = temporal_dim
self.boundary_ratio = boundary_ratio
self.num_samples = num_samples
self.num_samples_per_bin = num_samples_per_bin
self.feat_dim = feat_dim
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.post_process_top_k = post_process_top_k
self.feature_extraction_interval = feature_extraction_interval
self.loss_cls = MODELS.build(loss_cls)
self.hidden_dim_1d = hidden_dim_1d
self.hidden_dim_2d = hidden_dim_2d
self.hidden_dim_3d = hidden_dim_3d
self._get_interp1d_mask()
# Base Module
self.x_1d_b = nn.Sequential(
nn.Conv1d(
self.feat_dim,
self.hidden_dim_1d,
kernel_size=3,
padding=1,
groups=4), nn.ReLU(inplace=True),
nn.Conv1d(
self.hidden_dim_1d,
self.hidden_dim_1d,
kernel_size=3,
padding=1,
groups=4), nn.ReLU(inplace=True))
# Temporal Evaluation Module
self.x_1d_s = nn.Sequential(
nn.Conv1d(
self.hidden_dim_1d,
self.hidden_dim_1d,
kernel_size=3,
padding=1,
groups=4), nn.ReLU(inplace=True),
nn.Conv1d(self.hidden_dim_1d, 1, kernel_size=1), nn.Sigmoid())
self.x_1d_e = nn.Sequential(
nn.Conv1d(
self.hidden_dim_1d,
self.hidden_dim_1d,
kernel_size=3,
padding=1,
groups=4), nn.ReLU(inplace=True),
nn.Conv1d(self.hidden_dim_1d, 1, kernel_size=1), nn.Sigmoid())
# Proposal Evaluation Module
self.x_1d_p = nn.Sequential(
nn.Conv1d(
self.hidden_dim_1d,
self.hidden_dim_1d,
kernel_size=3,
padding=1), nn.ReLU(inplace=True))
self.x_3d_p = nn.Sequential(
nn.Conv3d(
self.hidden_dim_1d,
self.hidden_dim_3d,
kernel_size=(self.num_samples, 1, 1)), nn.ReLU(inplace=True))
self.x_2d_p = nn.Sequential(
nn.Conv2d(self.hidden_dim_3d, self.hidden_dim_2d, kernel_size=1),
nn.ReLU(inplace=True),
nn.Conv2d(
self.hidden_dim_2d,
self.hidden_dim_2d,
kernel_size=3,
padding=1), nn.ReLU(inplace=True),
nn.Conv2d(
self.hidden_dim_2d,
self.hidden_dim_2d,
kernel_size=3,
padding=1), nn.ReLU(inplace=True),
nn.Conv2d(self.hidden_dim_2d, 2, kernel_size=1), nn.Sigmoid())
self.anchors_tmins, self.anchors_tmaxs = self._temporal_anchors(
-0.5, 1.5)
self.match_map = self._match_map()
# self.bm_mask = self._get_bm_mask()
self.register_buffer('bm_mask', self._get_bm_mask())
def init_weights(self) -> None:
"""Initiate the parameters from scratch."""
pass
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.
"""
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 loss(self, batch_inputs, batch_data_samples, **kwargs):
"""Calculate losses from a batch of inputs and data samples.
Args:
batch_inputs (Tensor): Raw Inputs of the recognizer.
These should usually be mean centered and std scaled.
batch_data_samples (List[:obj:`ActionDataSample`]): The batch
data samples. It usually includes information such
as ``gt_labels``.
Returns:
dict: A dictionary of loss components.
"""
gt_bbox = [
sample.gt_instances['gt_bbox'] for sample in batch_data_samples
]
label_confidence, label_start, label_end = self.generate_labels(
gt_bbox)
device = batch_inputs.device
label_confidence = label_confidence.to(device)
label_start = label_start.to(device)
label_end = label_end.to(device)
confidence_map, start, end = self._forward(batch_inputs)
loss = self.loss_cls(confidence_map, start, end, label_confidence,
label_start, label_end, self.bm_mask)
loss_dict = dict(loss=loss[0])
return loss_dict
def predict(self, batch_inputs, batch_data_samples, **kwargs):
"""Define the computation performed at every call when testing."""
confidence_map, start, end = self._forward(batch_inputs)
start_scores = start[0].cpu().numpy()
end_scores = end[0].cpu().numpy()
cls_confidence = (confidence_map[0][1]).cpu().numpy()
reg_confidence = (confidence_map[0][0]).cpu().numpy()
max_start = max(start_scores)
max_end = max(end_scores)
# generate the set of start points and end points
start_bins = np.zeros(len(start_scores))
start_bins[0] = 1 # [1,0,0...,0,0]
end_bins = np.zeros(len(end_scores))
end_bins[-1] = 1 # [0,0,0...,0,1]
for idx in range(1, self.tscale - 1):
if start_scores[idx] > start_scores[
idx + 1] and start_scores[idx] > start_scores[idx - 1]:
start_bins[idx] = 1
elif start_scores[idx] > (0.5 * max_start):
start_bins[idx] = 1
if end_scores[idx] > end_scores[
idx + 1] and end_scores[idx] > end_scores[idx - 1]:
end_bins[idx] = 1
elif end_scores[idx] > (0.5 * max_end):
end_bins[idx] = 1
# iterate through all combinations of start_index and end_index
new_proposals = []
for idx in range(self.tscale):
for jdx in range(self.tscale):
start_index = jdx
end_index = start_index + idx + 1
if end_index < self.tscale and start_bins[
start_index] == 1 and end_bins[end_index] == 1:
tmin = start_index / self.tscale
tmax = end_index / self.tscale
tmin_score = start_scores[start_index]
tmax_score = end_scores[end_index]
cls_score = cls_confidence[idx, jdx]
reg_score = reg_confidence[idx, jdx]
score = tmin_score * tmax_score * cls_score * reg_score
new_proposals.append([
tmin, tmax, tmin_score, tmax_score, cls_score,
reg_score, score
])
new_proposals = np.stack(new_proposals)
video_info = batch_data_samples[0].metainfo
proposal_list = post_processing(new_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
@staticmethod
def _get_interp1d_bin_mask(seg_tmin, seg_tmax, tscale, num_samples,
num_samples_per_bin):
"""Generate sample mask for a boundary-matching pair."""
plen = float(seg_tmax - seg_tmin)
plen_sample = plen / (num_samples * num_samples_per_bin - 1.0)
total_samples = [
seg_tmin + plen_sample * i
for i in range(num_samples * num_samples_per_bin)
]
p_mask = []
for idx in range(num_samples):
bin_samples = total_samples[idx * num_samples_per_bin:(idx + 1) *
num_samples_per_bin]
bin_vector = np.zeros(tscale)
for sample in bin_samples:
sample_upper = math.ceil(sample)
sample_decimal, sample_down = math.modf(sample)
if 0 <= int(sample_down) <= (tscale - 1):
bin_vector[int(sample_down)] += 1 - sample_decimal
if 0 <= int(sample_upper) <= (tscale - 1):
bin_vector[int(sample_upper)] += sample_decimal
bin_vector = 1.0 / num_samples_per_bin * bin_vector
p_mask.append(bin_vector)
p_mask = np.stack(p_mask, axis=1)
return p_mask
def _get_interp1d_mask(self):
"""Generate sample mask for each point in Boundary-Matching Map."""
mask_mat = []
for start_index in range(self.tscale):
mask_mat_vector = []
for duration_index in range(self.tscale):
if start_index + duration_index < self.tscale:
p_tmin = start_index
p_tmax = start_index + duration_index
center_len = float(p_tmax - p_tmin) + 1
sample_tmin = p_tmin - (center_len * self.boundary_ratio)
sample_tmax = p_tmax + (center_len * self.boundary_ratio)
p_mask = self._get_interp1d_bin_mask(
sample_tmin, sample_tmax, self.tscale,
self.num_samples, self.num_samples_per_bin)
else:
p_mask = np.zeros([self.tscale, self.num_samples])
mask_mat_vector.append(p_mask)
mask_mat_vector = np.stack(mask_mat_vector, axis=2)
mask_mat.append(mask_mat_vector)
mask_mat = np.stack(mask_mat, axis=3)
mask_mat = mask_mat.astype(np.float32)
self.sample_mask = nn.Parameter(
torch.tensor(mask_mat).view(self.tscale, -1), requires_grad=False)
def _get_bm_mask(self):
"""Generate Boundary-Matching Mask."""
bm_mask = []
for idx in range(self.tscale):
mask_vector = [1] * (self.tscale - idx) + [0] * idx
bm_mask.append(mask_vector)
bm_mask = torch.tensor(bm_mask, dtype=torch.float)
return bm_mask
def _match_map(self):
"""Generate match map."""
temporal_gap = 1. / self.tscale
match_map = []
for idx in range(self.tscale):
match_window = []
tmin = temporal_gap * idx
for jdx in range(1, self.tscale + 1):
tmax = tmin + temporal_gap * jdx
match_window.append([tmin, tmax])
match_map.append(match_window)
match_map = np.array(match_map)
match_map = np.transpose(match_map, [1, 0, 2])
match_map = np.reshape(match_map, [-1, 2])
return match_map
def _temporal_anchors(self, tmin_offset=0., tmax_offset=1.):
"""Generate temporal anchors.
Args:
tmin_offset (int): Offset for the minimum value of temporal anchor.
Default: 0.
tmax_offset (int): Offset for the maximum value of temporal anchor.
Default: 1.
Returns:
tuple[Sequence[float]]: The minimum and maximum values of temporal
anchors.
"""
temporal_gap = 1. / self.tscale
anchors_tmins = []
anchors_tmaxs = []
for i in range(self.tscale):
anchors_tmins.append(temporal_gap * (i + tmin_offset))
anchors_tmaxs.append(temporal_gap * (i + tmax_offset))
return anchors_tmins, anchors_tmaxs
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.shape [batch_size, self.feat_dim, self.tscale]
base_feature = self.x_1d_b(x)
# base_feature.shape [batch_size, self.hidden_dim_1d, self.tscale]
start = self.x_1d_s(base_feature).squeeze(1)
# start.shape [batch_size, self.tscale]
end = self.x_1d_e(base_feature).squeeze(1)
# end.shape [batch_size, self.tscale]
confidence_map = self.x_1d_p(base_feature)
# [batch_size, self.hidden_dim_1d, self.tscale]
confidence_map = self._boundary_matching_layer(confidence_map)
# [batch_size, self.hidden_dim_1d,, self.num_sampls, self.tscale, self.tscale] # noqa
confidence_map = self.x_3d_p(confidence_map).squeeze(2)
# [batch_size, self.hidden_dim_3d, self.tscale, self.tscale]
confidence_map = self.x_2d_p(confidence_map)
# [batch_size, 2, self.tscale, self.tscale]
return confidence_map, start, end
def _boundary_matching_layer(self, x):
"""Generate matching layer."""
input_size = x.size()
out = torch.matmul(x,
self.sample_mask).reshape(input_size[0],
input_size[1],
self.num_samples,
self.tscale, self.tscale)
return out
def generate_labels(self, gt_bbox):
"""Generate training labels."""
# TODO: do this without numpy
match_score_confidence_list = []
match_score_start_list = []
match_score_end_list = []
for every_gt_bbox in gt_bbox:
gt_iou_map = []
every_gt_bbox = every_gt_bbox.cpu()
for start, end in every_gt_bbox:
if isinstance(start, torch.Tensor):
start = start.numpy()
if isinstance(end, torch.Tensor):
end = end.numpy()
current_gt_iou_map = temporal_iou(self.match_map[:, 0],
self.match_map[:, 1], start,
end)
current_gt_iou_map = np.reshape(current_gt_iou_map,
[self.tscale, self.tscale])
gt_iou_map.append(current_gt_iou_map)
gt_iou_map = np.array(gt_iou_map).astype(np.float32)
gt_iou_map = np.max(gt_iou_map, axis=0)
gt_tmins = every_gt_bbox[:, 0]
gt_tmaxs = every_gt_bbox[:, 1]
gt_len_pad = 3 * (1. / self.tscale)
gt_start_bboxs = np.stack(
(gt_tmins - gt_len_pad / 2, gt_tmins + gt_len_pad / 2), axis=1)
gt_end_bboxs = np.stack(
(gt_tmaxs - gt_len_pad / 2, gt_tmaxs + gt_len_pad / 2), axis=1)
match_score_start = []
match_score_end = []
for anchor_tmin, anchor_tmax in zip(self.anchors_tmins,
self.anchors_tmaxs):
match_score_start.append(
np.max(
temporal_iop(anchor_tmin, anchor_tmax,
gt_start_bboxs[:, 0], gt_start_bboxs[:,
1])))
match_score_end.append(
np.max(
temporal_iop(anchor_tmin, anchor_tmax,
gt_end_bboxs[:, 0], gt_end_bboxs[:, 1])))
match_score_confidence_list.append(gt_iou_map)
match_score_start_list.append(match_score_start)
match_score_end_list.append(match_score_end)
def to_tensor(x):
return torch.Tensor(np.array(x))
match_score_confidence_list = to_tensor(match_score_confidence_list)
match_score_start_list = to_tensor(match_score_start_list)
match_score_end_list = to_tensor(match_score_end_list)
return (match_score_confidence_list, match_score_start_list,
match_score_end_list)
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