From bcfd6f994d5e612d6e84662a66a4d0ed8542fe2d Mon Sep 17 00:00:00 2001 From: Alexey Borsky Date: Wed, 3 May 2023 02:48:46 +0300 Subject: [PATCH] Add only necessary RAFT code --- RAFT/LICENSE | 29 +++++ RAFT/corr.py | 91 +++++++++++++ RAFT/extractor.py | 267 ++++++++++++++++++++++++++++++++++++++ RAFT/raft.py | 144 ++++++++++++++++++++ RAFT/update.py | 139 ++++++++++++++++++++ RAFT/utils/__init__.py | 0 RAFT/utils/augmentor.py | 246 +++++++++++++++++++++++++++++++++++ RAFT/utils/flow_viz.py | 132 +++++++++++++++++++ RAFT/utils/frame_utils.py | 137 +++++++++++++++++++ RAFT/utils/utils.py | 82 ++++++++++++ 10 files changed, 1267 insertions(+) create mode 100644 RAFT/LICENSE create mode 100644 RAFT/corr.py create mode 100644 RAFT/extractor.py create mode 100644 RAFT/raft.py create mode 100644 RAFT/update.py create mode 100644 RAFT/utils/__init__.py create mode 100644 RAFT/utils/augmentor.py create mode 100644 RAFT/utils/flow_viz.py create mode 100644 RAFT/utils/frame_utils.py create mode 100644 RAFT/utils/utils.py diff --git a/RAFT/LICENSE b/RAFT/LICENSE new file mode 100644 index 0000000..ed13d84 --- /dev/null +++ b/RAFT/LICENSE @@ -0,0 +1,29 @@ +BSD 3-Clause License + +Copyright (c) 2020, princeton-vl +All rights reserved. + +Redistribution and use in source and binary forms, with or without +modification, are permitted provided that the following conditions are met: + +* Redistributions of source code must retain the above copyright notice, this + list of conditions and the following disclaimer. + +* Redistributions in binary form must reproduce the above copyright notice, + this list of conditions and the following disclaimer in the documentation + and/or other materials provided with the distribution. + +* Neither the name of the copyright holder nor the names of its + contributors may be used to endorse or promote products derived from + this software without specific prior written permission. + +THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS "AS IS" +AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE +IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE ARE +DISCLAIMED. IN NO EVENT SHALL THE COPYRIGHT HOLDER OR CONTRIBUTORS BE LIABLE +FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL +DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR +SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER +CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, +OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE +OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE. diff --git a/RAFT/corr.py b/RAFT/corr.py new file mode 100644 index 0000000..3e00d8f --- /dev/null +++ b/RAFT/corr.py @@ -0,0 +1,91 @@ +import torch +import torch.nn.functional as F +from RAFT.utils.utils import bilinear_sampler, coords_grid + +try: + import alt_cuda_corr +except: + # alt_cuda_corr is not compiled + pass + + +class CorrBlock: + def __init__(self, fmap1, fmap2, num_levels=4, radius=4): + self.num_levels = num_levels + self.radius = radius + self.corr_pyramid = [] + + # all pairs correlation + corr = CorrBlock.corr(fmap1, fmap2) + + batch, h1, w1, dim, h2, w2 = corr.shape + corr = corr.reshape(batch*h1*w1, dim, h2, w2) + + self.corr_pyramid.append(corr) + for i in range(self.num_levels-1): + corr = F.avg_pool2d(corr, 2, stride=2) + self.corr_pyramid.append(corr) + + def __call__(self, coords): + r = self.radius + coords = coords.permute(0, 2, 3, 1) + batch, h1, w1, _ = coords.shape + + out_pyramid = [] + for i in range(self.num_levels): + corr = self.corr_pyramid[i] + dx = torch.linspace(-r, r, 2*r+1, device=coords.device) + dy = torch.linspace(-r, r, 2*r+1, device=coords.device) + delta = torch.stack(torch.meshgrid(dy, dx), axis=-1) + + centroid_lvl = coords.reshape(batch*h1*w1, 1, 1, 2) / 2**i + delta_lvl = delta.view(1, 2*r+1, 2*r+1, 2) + coords_lvl = centroid_lvl + delta_lvl + + corr = bilinear_sampler(corr, coords_lvl) + corr = corr.view(batch, h1, w1, -1) + out_pyramid.append(corr) + + out = torch.cat(out_pyramid, dim=-1) + return out.permute(0, 3, 1, 2).contiguous().float() + + @staticmethod + def corr(fmap1, fmap2): + batch, dim, ht, wd = fmap1.shape + fmap1 = fmap1.view(batch, dim, ht*wd) + fmap2 = fmap2.view(batch, dim, ht*wd) + + corr = torch.matmul(fmap1.transpose(1,2), fmap2) + corr = corr.view(batch, ht, wd, 1, ht, wd) + return corr / torch.sqrt(torch.tensor(dim).float()) + + +class AlternateCorrBlock: + def __init__(self, fmap1, fmap2, num_levels=4, radius=4): + self.num_levels = num_levels + self.radius = radius + + self.pyramid = [(fmap1, fmap2)] + for i in range(self.num_levels): + fmap1 = F.avg_pool2d(fmap1, 2, stride=2) + fmap2 = F.avg_pool2d(fmap2, 2, stride=2) + self.pyramid.append((fmap1, fmap2)) + + def __call__(self, coords): + coords = coords.permute(0, 2, 3, 1) + B, H, W, _ = coords.shape + dim = self.pyramid[0][0].shape[1] + + corr_list = [] + for i in range(self.num_levels): + r = self.radius + fmap1_i = self.pyramid[0][0].permute(0, 2, 3, 1).contiguous() + fmap2_i = self.pyramid[i][1].permute(0, 2, 3, 1).contiguous() + + coords_i = (coords / 2**i).reshape(B, 1, H, W, 2).contiguous() + corr, = alt_cuda_corr.forward(fmap1_i, fmap2_i, coords_i, r) + corr_list.append(corr.squeeze(1)) + + corr = torch.stack(corr_list, dim=1) + corr = corr.reshape(B, -1, H, W) + return corr / torch.sqrt(torch.tensor(dim).float()) diff --git a/RAFT/extractor.py b/RAFT/extractor.py new file mode 100644 index 0000000..9a9c759 --- /dev/null +++ b/RAFT/extractor.py @@ -0,0 +1,267 @@ +import torch +import torch.nn as nn +import torch.nn.functional as F + + +class ResidualBlock(nn.Module): + def __init__(self, in_planes, planes, norm_fn='group', stride=1): + super(ResidualBlock, self).__init__() + + self.conv1 = nn.Conv2d(in_planes, planes, kernel_size=3, padding=1, stride=stride) + self.conv2 = nn.Conv2d(planes, planes, kernel_size=3, padding=1) + self.relu = nn.ReLU(inplace=True) + + num_groups = planes // 8 + + if norm_fn == 'group': + self.norm1 = nn.GroupNorm(num_groups=num_groups, num_channels=planes) + self.norm2 = nn.GroupNorm(num_groups=num_groups, num_channels=planes) + if not stride == 1: + self.norm3 = nn.GroupNorm(num_groups=num_groups, num_channels=planes) + + elif norm_fn == 'batch': + self.norm1 = nn.BatchNorm2d(planes) + self.norm2 = nn.BatchNorm2d(planes) + if not stride == 1: + self.norm3 = nn.BatchNorm2d(planes) + + elif norm_fn == 'instance': + self.norm1 = nn.InstanceNorm2d(planes) + self.norm2 = nn.InstanceNorm2d(planes) + if not stride == 1: + self.norm3 = nn.InstanceNorm2d(planes) + + elif norm_fn == 'none': + self.norm1 = nn.Sequential() + self.norm2 = nn.Sequential() + if not stride == 1: + self.norm3 = nn.Sequential() + + if stride == 1: + self.downsample = None + + else: + self.downsample = nn.Sequential( + nn.Conv2d(in_planes, planes, kernel_size=1, stride=stride), self.norm3) + + + def forward(self, x): + y = x + y = self.relu(self.norm1(self.conv1(y))) + y = self.relu(self.norm2(self.conv2(y))) + + if self.downsample is not None: + x = self.downsample(x) + + return self.relu(x+y) + + + +class BottleneckBlock(nn.Module): + def __init__(self, in_planes, planes, norm_fn='group', stride=1): + super(BottleneckBlock, self).__init__() + + self.conv1 = nn.Conv2d(in_planes, planes//4, kernel_size=1, padding=0) + self.conv2 = nn.Conv2d(planes//4, planes//4, kernel_size=3, padding=1, stride=stride) + self.conv3 = nn.Conv2d(planes//4, planes, kernel_size=1, padding=0) + self.relu = nn.ReLU(inplace=True) + + num_groups = planes // 8 + + if norm_fn == 'group': + self.norm1 = nn.GroupNorm(num_groups=num_groups, num_channels=planes//4) + self.norm2 = nn.GroupNorm(num_groups=num_groups, num_channels=planes//4) + self.norm3 = nn.GroupNorm(num_groups=num_groups, num_channels=planes) + if not stride == 1: + self.norm4 = nn.GroupNorm(num_groups=num_groups, num_channels=planes) + + elif norm_fn == 'batch': + self.norm1 = nn.BatchNorm2d(planes//4) + self.norm2 = nn.BatchNorm2d(planes//4) + self.norm3 = nn.BatchNorm2d(planes) + if not stride == 1: + self.norm4 = nn.BatchNorm2d(planes) + + elif norm_fn == 'instance': + self.norm1 = nn.InstanceNorm2d(planes//4) + self.norm2 = nn.InstanceNorm2d(planes//4) + self.norm3 = nn.InstanceNorm2d(planes) + if not stride == 1: + self.norm4 = nn.InstanceNorm2d(planes) + + elif norm_fn == 'none': + self.norm1 = nn.Sequential() + self.norm2 = nn.Sequential() + self.norm3 = nn.Sequential() + if not stride == 1: + self.norm4 = nn.Sequential() + + if stride == 1: + self.downsample = None + + else: + self.downsample = nn.Sequential( + nn.Conv2d(in_planes, planes, kernel_size=1, stride=stride), self.norm4) + + + def forward(self, x): + y = x + y = self.relu(self.norm1(self.conv1(y))) + y = self.relu(self.norm2(self.conv2(y))) + y = self.relu(self.norm3(self.conv3(y))) + + if self.downsample is not None: + x = self.downsample(x) + + return self.relu(x+y) + +class BasicEncoder(nn.Module): + def __init__(self, output_dim=128, norm_fn='batch', dropout=0.0): + super(BasicEncoder, self).__init__() + self.norm_fn = norm_fn + + if self.norm_fn == 'group': + self.norm1 = nn.GroupNorm(num_groups=8, num_channels=64) + + elif self.norm_fn == 'batch': + self.norm1 = nn.BatchNorm2d(64) + + elif self.norm_fn == 'instance': + self.norm1 = nn.InstanceNorm2d(64) + + elif self.norm_fn == 'none': + self.norm1 = nn.Sequential() + + self.conv1 = nn.Conv2d(3, 64, kernel_size=7, stride=2, padding=3) + self.relu1 = nn.ReLU(inplace=True) + + self.in_planes = 64 + self.layer1 = self._make_layer(64, stride=1) + self.layer2 = self._make_layer(96, stride=2) + self.layer3 = self._make_layer(128, stride=2) + + # output convolution + self.conv2 = nn.Conv2d(128, output_dim, kernel_size=1) + + self.dropout = None + if dropout > 0: + self.dropout = nn.Dropout2d(p=dropout) + + for m in self.modules(): + if isinstance(m, nn.Conv2d): + nn.init.kaiming_normal_(m.weight, mode='fan_out', nonlinearity='relu') + elif isinstance(m, (nn.BatchNorm2d, nn.InstanceNorm2d, nn.GroupNorm)): + if m.weight is not None: + nn.init.constant_(m.weight, 1) + if m.bias is not None: + nn.init.constant_(m.bias, 0) + + def _make_layer(self, dim, stride=1): + layer1 = ResidualBlock(self.in_planes, dim, self.norm_fn, stride=stride) + layer2 = ResidualBlock(dim, dim, self.norm_fn, stride=1) + layers = (layer1, layer2) + + self.in_planes = dim + return nn.Sequential(*layers) + + + def forward(self, x): + + # if input is list, combine batch dimension + is_list = isinstance(x, tuple) or isinstance(x, list) + if is_list: + batch_dim = x[0].shape[0] + x = torch.cat(x, dim=0) + + x = self.conv1(x) + x = self.norm1(x) + x = self.relu1(x) + + x = self.layer1(x) + x = self.layer2(x) + x = self.layer3(x) + + x = self.conv2(x) + + if self.training and self.dropout is not None: + x = self.dropout(x) + + if is_list: + x = torch.split(x, [batch_dim, batch_dim], dim=0) + + return x + + +class SmallEncoder(nn.Module): + def __init__(self, output_dim=128, norm_fn='batch', dropout=0.0): + super(SmallEncoder, self).__init__() + self.norm_fn = norm_fn + + if self.norm_fn == 'group': + self.norm1 = nn.GroupNorm(num_groups=8, num_channels=32) + + elif self.norm_fn == 'batch': + self.norm1 = nn.BatchNorm2d(32) + + elif self.norm_fn == 'instance': + self.norm1 = nn.InstanceNorm2d(32) + + elif self.norm_fn == 'none': + self.norm1 = nn.Sequential() + + self.conv1 = nn.Conv2d(3, 32, kernel_size=7, stride=2, padding=3) + self.relu1 = nn.ReLU(inplace=True) + + self.in_planes = 32 + self.layer1 = self._make_layer(32, stride=1) + self.layer2 = self._make_layer(64, stride=2) + self.layer3 = self._make_layer(96, stride=2) + + self.dropout = None + if dropout > 0: + self.dropout = nn.Dropout2d(p=dropout) + + self.conv2 = nn.Conv2d(96, output_dim, kernel_size=1) + + for m in self.modules(): + if isinstance(m, nn.Conv2d): + nn.init.kaiming_normal_(m.weight, mode='fan_out', nonlinearity='relu') + elif isinstance(m, (nn.BatchNorm2d, nn.InstanceNorm2d, nn.GroupNorm)): + if m.weight is not None: + nn.init.constant_(m.weight, 1) + if m.bias is not None: + nn.init.constant_(m.bias, 0) + + def _make_layer(self, dim, stride=1): + layer1 = BottleneckBlock(self.in_planes, dim, self.norm_fn, stride=stride) + layer2 = BottleneckBlock(dim, dim, self.norm_fn, stride=1) + layers = (layer1, layer2) + + self.in_planes = dim + return nn.Sequential(*layers) + + + def forward(self, x): + + # if input is list, combine batch dimension + is_list = isinstance(x, tuple) or isinstance(x, list) + if is_list: + batch_dim = x[0].shape[0] + x = torch.cat(x, dim=0) + + x = self.conv1(x) + x = self.norm1(x) + x = self.relu1(x) + + x = self.layer1(x) + x = self.layer2(x) + x = self.layer3(x) + x = self.conv2(x) + + if self.training and self.dropout is not None: + x = self.dropout(x) + + if is_list: + x = torch.split(x, [batch_dim, batch_dim], dim=0) + + return x diff --git a/RAFT/raft.py b/RAFT/raft.py new file mode 100644 index 0000000..1561cb4 --- /dev/null +++ b/RAFT/raft.py @@ -0,0 +1,144 @@ +import numpy as np +import torch +import torch.nn as nn +import torch.nn.functional as F + +from RAFT.update import BasicUpdateBlock, SmallUpdateBlock +from RAFT.extractor import BasicEncoder, SmallEncoder +from RAFT.corr import CorrBlock, AlternateCorrBlock +from RAFT.utils.utils import bilinear_sampler, coords_grid, upflow8 + +try: + autocast = torch.cuda.amp.autocast +except: + # dummy autocast for PyTorch < 1.6 + class autocast: + def __init__(self, enabled): + pass + def __enter__(self): + pass + def __exit__(self, *args): + pass + + +class RAFT(nn.Module): + def __init__(self, args): + super(RAFT, self).__init__() + self.args = args + + if args.small: + self.hidden_dim = hdim = 96 + self.context_dim = cdim = 64 + args.corr_levels = 4 + args.corr_radius = 3 + + else: + self.hidden_dim = hdim = 128 + self.context_dim = cdim = 128 + args.corr_levels = 4 + args.corr_radius = 4 + + if 'dropout' not in self.args: + self.args.dropout = 0 + + if 'alternate_corr' not in self.args: + self.args.alternate_corr = False + + # feature network, context network, and update block + if args.small: + self.fnet = SmallEncoder(output_dim=128, norm_fn='instance', dropout=args.dropout) + self.cnet = SmallEncoder(output_dim=hdim+cdim, norm_fn='none', dropout=args.dropout) + self.update_block = SmallUpdateBlock(self.args, hidden_dim=hdim) + + else: + self.fnet = BasicEncoder(output_dim=256, norm_fn='instance', dropout=args.dropout) + self.cnet = BasicEncoder(output_dim=hdim+cdim, norm_fn='batch', dropout=args.dropout) + self.update_block = BasicUpdateBlock(self.args, hidden_dim=hdim) + + def freeze_bn(self): + for m in self.modules(): + if isinstance(m, nn.BatchNorm2d): + m.eval() + + def initialize_flow(self, img): + """ Flow is represented as difference between two coordinate grids flow = coords1 - coords0""" + N, C, H, W = img.shape + coords0 = coords_grid(N, H//8, W//8, device=img.device) + coords1 = coords_grid(N, H//8, W//8, device=img.device) + + # optical flow computed as difference: flow = coords1 - coords0 + return coords0, coords1 + + def upsample_flow(self, flow, mask): + """ Upsample flow field [H/8, W/8, 2] -> [H, W, 2] using convex combination """ + N, _, H, W = flow.shape + mask = mask.view(N, 1, 9, 8, 8, H, W) + mask = torch.softmax(mask, dim=2) + + up_flow = F.unfold(8 * flow, [3,3], padding=1) + up_flow = up_flow.view(N, 2, 9, 1, 1, H, W) + + up_flow = torch.sum(mask * up_flow, dim=2) + up_flow = up_flow.permute(0, 1, 4, 2, 5, 3) + return up_flow.reshape(N, 2, 8*H, 8*W) + + + def forward(self, image1, image2, iters=12, flow_init=None, upsample=True, test_mode=False): + """ Estimate optical flow between pair of frames """ + + image1 = 2 * (image1 / 255.0) - 1.0 + image2 = 2 * (image2 / 255.0) - 1.0 + + image1 = image1.contiguous() + image2 = image2.contiguous() + + hdim = self.hidden_dim + cdim = self.context_dim + + # run the feature network + with autocast(enabled=self.args.mixed_precision): + fmap1, fmap2 = self.fnet([image1, image2]) + + fmap1 = fmap1.float() + fmap2 = fmap2.float() + if self.args.alternate_corr: + corr_fn = AlternateCorrBlock(fmap1, fmap2, radius=self.args.corr_radius) + else: + corr_fn = CorrBlock(fmap1, fmap2, radius=self.args.corr_radius) + + # run the context network + with autocast(enabled=self.args.mixed_precision): + cnet = self.cnet(image1) + net, inp = torch.split(cnet, [hdim, cdim], dim=1) + net = torch.tanh(net) + inp = torch.relu(inp) + + coords0, coords1 = self.initialize_flow(image1) + + if flow_init is not None: + coords1 = coords1 + flow_init + + flow_predictions = [] + for itr in range(iters): + coords1 = coords1.detach() + corr = corr_fn(coords1) # index correlation volume + + flow = coords1 - coords0 + with autocast(enabled=self.args.mixed_precision): + net, up_mask, delta_flow = self.update_block(net, inp, corr, flow) + + # F(t+1) = F(t) + \Delta(t) + coords1 = coords1 + delta_flow + + # upsample predictions + if up_mask is None: + flow_up = upflow8(coords1 - coords0) + else: + flow_up = self.upsample_flow(coords1 - coords0, up_mask) + + flow_predictions.append(flow_up) + + if test_mode: + return coords1 - coords0, flow_up + + return flow_predictions diff --git a/RAFT/update.py b/RAFT/update.py new file mode 100644 index 0000000..f940497 --- /dev/null +++ b/RAFT/update.py @@ -0,0 +1,139 @@ +import torch +import torch.nn as nn +import torch.nn.functional as F + + +class FlowHead(nn.Module): + def __init__(self, input_dim=128, hidden_dim=256): + super(FlowHead, self).__init__() + self.conv1 = nn.Conv2d(input_dim, hidden_dim, 3, padding=1) + self.conv2 = nn.Conv2d(hidden_dim, 2, 3, padding=1) + self.relu = nn.ReLU(inplace=True) + + def forward(self, x): + return self.conv2(self.relu(self.conv1(x))) + +class ConvGRU(nn.Module): + def __init__(self, hidden_dim=128, input_dim=192+128): + super(ConvGRU, self).__init__() + self.convz = nn.Conv2d(hidden_dim+input_dim, hidden_dim, 3, padding=1) + self.convr = nn.Conv2d(hidden_dim+input_dim, hidden_dim, 3, padding=1) + self.convq = nn.Conv2d(hidden_dim+input_dim, hidden_dim, 3, padding=1) + + def forward(self, h, x): + hx = torch.cat([h, x], dim=1) + + z = torch.sigmoid(self.convz(hx)) + r = torch.sigmoid(self.convr(hx)) + q = torch.tanh(self.convq(torch.cat([r*h, x], dim=1))) + + h = (1-z) * h + z * q + return h + +class SepConvGRU(nn.Module): + def __init__(self, hidden_dim=128, input_dim=192+128): + super(SepConvGRU, self).__init__() + self.convz1 = nn.Conv2d(hidden_dim+input_dim, hidden_dim, (1,5), padding=(0,2)) + self.convr1 = nn.Conv2d(hidden_dim+input_dim, hidden_dim, (1,5), padding=(0,2)) + self.convq1 = nn.Conv2d(hidden_dim+input_dim, hidden_dim, (1,5), padding=(0,2)) + + self.convz2 = nn.Conv2d(hidden_dim+input_dim, hidden_dim, (5,1), padding=(2,0)) + self.convr2 = nn.Conv2d(hidden_dim+input_dim, hidden_dim, (5,1), padding=(2,0)) + self.convq2 = nn.Conv2d(hidden_dim+input_dim, hidden_dim, (5,1), padding=(2,0)) + + + def forward(self, h, x): + # horizontal + hx = torch.cat([h, x], dim=1) + z = torch.sigmoid(self.convz1(hx)) + r = torch.sigmoid(self.convr1(hx)) + q = torch.tanh(self.convq1(torch.cat([r*h, x], dim=1))) + h = (1-z) * h + z * q + + # vertical + hx = torch.cat([h, x], dim=1) + z = torch.sigmoid(self.convz2(hx)) + r = torch.sigmoid(self.convr2(hx)) + q = torch.tanh(self.convq2(torch.cat([r*h, x], dim=1))) + h = (1-z) * h + z * q + + return h + +class SmallMotionEncoder(nn.Module): + def __init__(self, args): + super(SmallMotionEncoder, self).__init__() + cor_planes = args.corr_levels * (2*args.corr_radius + 1)**2 + self.convc1 = nn.Conv2d(cor_planes, 96, 1, padding=0) + self.convf1 = nn.Conv2d(2, 64, 7, padding=3) + self.convf2 = nn.Conv2d(64, 32, 3, padding=1) + self.conv = nn.Conv2d(128, 80, 3, padding=1) + + def forward(self, flow, corr): + cor = F.relu(self.convc1(corr)) + flo = F.relu(self.convf1(flow)) + flo = F.relu(self.convf2(flo)) + cor_flo = torch.cat([cor, flo], dim=1) + out = F.relu(self.conv(cor_flo)) + return torch.cat([out, flow], dim=1) + +class BasicMotionEncoder(nn.Module): + def __init__(self, args): + super(BasicMotionEncoder, self).__init__() + cor_planes = args.corr_levels * (2*args.corr_radius + 1)**2 + self.convc1 = nn.Conv2d(cor_planes, 256, 1, padding=0) + self.convc2 = nn.Conv2d(256, 192, 3, padding=1) + self.convf1 = nn.Conv2d(2, 128, 7, padding=3) + self.convf2 = nn.Conv2d(128, 64, 3, padding=1) + self.conv = nn.Conv2d(64+192, 128-2, 3, padding=1) + + def forward(self, flow, corr): + cor = F.relu(self.convc1(corr)) + cor = F.relu(self.convc2(cor)) + flo = F.relu(self.convf1(flow)) + flo = F.relu(self.convf2(flo)) + + cor_flo = torch.cat([cor, flo], dim=1) + out = F.relu(self.conv(cor_flo)) + return torch.cat([out, flow], dim=1) + +class SmallUpdateBlock(nn.Module): + def __init__(self, args, hidden_dim=96): + super(SmallUpdateBlock, self).__init__() + self.encoder = SmallMotionEncoder(args) + self.gru = ConvGRU(hidden_dim=hidden_dim, input_dim=82+64) + self.flow_head = FlowHead(hidden_dim, hidden_dim=128) + + def forward(self, net, inp, corr, flow): + motion_features = self.encoder(flow, corr) + inp = torch.cat([inp, motion_features], dim=1) + net = self.gru(net, inp) + delta_flow = self.flow_head(net) + + return net, None, delta_flow + +class BasicUpdateBlock(nn.Module): + def __init__(self, args, hidden_dim=128, input_dim=128): + super(BasicUpdateBlock, self).__init__() + self.args = args + self.encoder = BasicMotionEncoder(args) + self.gru = SepConvGRU(hidden_dim=hidden_dim, input_dim=128+hidden_dim) + self.flow_head = FlowHead(hidden_dim, hidden_dim=256) + + self.mask = nn.Sequential( + nn.Conv2d(128, 256, 3, padding=1), + nn.ReLU(inplace=True), + nn.Conv2d(256, 64*9, 1, padding=0)) + + def forward(self, net, inp, corr, flow, upsample=True): + motion_features = self.encoder(flow, corr) + inp = torch.cat([inp, motion_features], dim=1) + + net = self.gru(net, inp) + delta_flow = self.flow_head(net) + + # scale mask to balence gradients + mask = .25 * self.mask(net) + return net, mask, delta_flow + + + diff --git a/RAFT/utils/__init__.py b/RAFT/utils/__init__.py new file mode 100644 index 0000000..e69de29 diff --git a/RAFT/utils/augmentor.py b/RAFT/utils/augmentor.py new file mode 100644 index 0000000..e81c4f2 --- /dev/null +++ b/RAFT/utils/augmentor.py @@ -0,0 +1,246 @@ +import numpy as np +import random +import math +from PIL import Image + +import cv2 +cv2.setNumThreads(0) +cv2.ocl.setUseOpenCL(False) + +import torch +from torchvision.transforms import ColorJitter +import torch.nn.functional as F + + +class FlowAugmentor: + def __init__(self, crop_size, min_scale=-0.2, max_scale=0.5, do_flip=True): + + # spatial augmentation params + self.crop_size = crop_size + self.min_scale = min_scale + self.max_scale = max_scale + self.spatial_aug_prob = 0.8 + self.stretch_prob = 0.8 + self.max_stretch = 0.2 + + # flip augmentation params + self.do_flip = do_flip + self.h_flip_prob = 0.5 + self.v_flip_prob = 0.1 + + # photometric augmentation params + self.photo_aug = ColorJitter(brightness=0.4, contrast=0.4, saturation=0.4, hue=0.5/3.14) + self.asymmetric_color_aug_prob = 0.2 + self.eraser_aug_prob = 0.5 + + def color_transform(self, img1, img2): + """ Photometric augmentation """ + + # asymmetric + if np.random.rand() < self.asymmetric_color_aug_prob: + img1 = np.array(self.photo_aug(Image.fromarray(img1)), dtype=np.uint8) + img2 = np.array(self.photo_aug(Image.fromarray(img2)), dtype=np.uint8) + + # symmetric + else: + image_stack = np.concatenate([img1, img2], axis=0) + image_stack = np.array(self.photo_aug(Image.fromarray(image_stack)), dtype=np.uint8) + img1, img2 = np.split(image_stack, 2, axis=0) + + return img1, img2 + + def eraser_transform(self, img1, img2, bounds=[50, 100]): + """ Occlusion augmentation """ + + ht, wd = img1.shape[:2] + if np.random.rand() < self.eraser_aug_prob: + mean_color = np.mean(img2.reshape(-1, 3), axis=0) + for _ in range(np.random.randint(1, 3)): + x0 = np.random.randint(0, wd) + y0 = np.random.randint(0, ht) + dx = np.random.randint(bounds[0], bounds[1]) + dy = np.random.randint(bounds[0], bounds[1]) + img2[y0:y0+dy, x0:x0+dx, :] = mean_color + + return img1, img2 + + def spatial_transform(self, img1, img2, flow): + # randomly sample scale + ht, wd = img1.shape[:2] + min_scale = np.maximum( + (self.crop_size[0] + 8) / float(ht), + (self.crop_size[1] + 8) / float(wd)) + + scale = 2 ** np.random.uniform(self.min_scale, self.max_scale) + scale_x = scale + scale_y = scale + if np.random.rand() < self.stretch_prob: + scale_x *= 2 ** np.random.uniform(-self.max_stretch, self.max_stretch) + scale_y *= 2 ** np.random.uniform(-self.max_stretch, self.max_stretch) + + scale_x = np.clip(scale_x, min_scale, None) + scale_y = np.clip(scale_y, min_scale, None) + + if np.random.rand() < self.spatial_aug_prob: + # rescale the images + img1 = cv2.resize(img1, None, fx=scale_x, fy=scale_y, interpolation=cv2.INTER_LINEAR) + img2 = cv2.resize(img2, None, fx=scale_x, fy=scale_y, interpolation=cv2.INTER_LINEAR) + flow = cv2.resize(flow, None, fx=scale_x, fy=scale_y, interpolation=cv2.INTER_LINEAR) + flow = flow * [scale_x, scale_y] + + if self.do_flip: + if np.random.rand() < self.h_flip_prob: # h-flip + img1 = img1[:, ::-1] + img2 = img2[:, ::-1] + flow = flow[:, ::-1] * [-1.0, 1.0] + + if np.random.rand() < self.v_flip_prob: # v-flip + img1 = img1[::-1, :] + img2 = img2[::-1, :] + flow = flow[::-1, :] * [1.0, -1.0] + + y0 = np.random.randint(0, img1.shape[0] - self.crop_size[0]) + x0 = np.random.randint(0, img1.shape[1] - self.crop_size[1]) + + img1 = img1[y0:y0+self.crop_size[0], x0:x0+self.crop_size[1]] + img2 = img2[y0:y0+self.crop_size[0], x0:x0+self.crop_size[1]] + flow = flow[y0:y0+self.crop_size[0], x0:x0+self.crop_size[1]] + + return img1, img2, flow + + def __call__(self, img1, img2, flow): + img1, img2 = self.color_transform(img1, img2) + img1, img2 = self.eraser_transform(img1, img2) + img1, img2, flow = self.spatial_transform(img1, img2, flow) + + img1 = np.ascontiguousarray(img1) + img2 = np.ascontiguousarray(img2) + flow = np.ascontiguousarray(flow) + + return img1, img2, flow + +class SparseFlowAugmentor: + def __init__(self, crop_size, min_scale=-0.2, max_scale=0.5, do_flip=False): + # spatial augmentation params + self.crop_size = crop_size + self.min_scale = min_scale + self.max_scale = max_scale + self.spatial_aug_prob = 0.8 + self.stretch_prob = 0.8 + self.max_stretch = 0.2 + + # flip augmentation params + self.do_flip = do_flip + self.h_flip_prob = 0.5 + self.v_flip_prob = 0.1 + + # photometric augmentation params + self.photo_aug = ColorJitter(brightness=0.3, contrast=0.3, saturation=0.3, hue=0.3/3.14) + self.asymmetric_color_aug_prob = 0.2 + self.eraser_aug_prob = 0.5 + + def color_transform(self, img1, img2): + image_stack = np.concatenate([img1, img2], axis=0) + image_stack = np.array(self.photo_aug(Image.fromarray(image_stack)), dtype=np.uint8) + img1, img2 = np.split(image_stack, 2, axis=0) + return img1, img2 + + def eraser_transform(self, img1, img2): + ht, wd = img1.shape[:2] + if np.random.rand() < self.eraser_aug_prob: + mean_color = np.mean(img2.reshape(-1, 3), axis=0) + for _ in range(np.random.randint(1, 3)): + x0 = np.random.randint(0, wd) + y0 = np.random.randint(0, ht) + dx = np.random.randint(50, 100) + dy = np.random.randint(50, 100) + img2[y0:y0+dy, x0:x0+dx, :] = mean_color + + return img1, img2 + + def resize_sparse_flow_map(self, flow, valid, fx=1.0, fy=1.0): + ht, wd = flow.shape[:2] + coords = np.meshgrid(np.arange(wd), np.arange(ht)) + coords = np.stack(coords, axis=-1) + + coords = coords.reshape(-1, 2).astype(np.float32) + flow = flow.reshape(-1, 2).astype(np.float32) + valid = valid.reshape(-1).astype(np.float32) + + coords0 = coords[valid>=1] + flow0 = flow[valid>=1] + + ht1 = int(round(ht * fy)) + wd1 = int(round(wd * fx)) + + coords1 = coords0 * [fx, fy] + flow1 = flow0 * [fx, fy] + + xx = np.round(coords1[:,0]).astype(np.int32) + yy = np.round(coords1[:,1]).astype(np.int32) + + v = (xx > 0) & (xx < wd1) & (yy > 0) & (yy < ht1) + xx = xx[v] + yy = yy[v] + flow1 = flow1[v] + + flow_img = np.zeros([ht1, wd1, 2], dtype=np.float32) + valid_img = np.zeros([ht1, wd1], dtype=np.int32) + + flow_img[yy, xx] = flow1 + valid_img[yy, xx] = 1 + + return flow_img, valid_img + + def spatial_transform(self, img1, img2, flow, valid): + # randomly sample scale + + ht, wd = img1.shape[:2] + min_scale = np.maximum( + (self.crop_size[0] + 1) / float(ht), + (self.crop_size[1] + 1) / float(wd)) + + scale = 2 ** np.random.uniform(self.min_scale, self.max_scale) + scale_x = np.clip(scale, min_scale, None) + scale_y = np.clip(scale, min_scale, None) + + if np.random.rand() < self.spatial_aug_prob: + # rescale the images + img1 = cv2.resize(img1, None, fx=scale_x, fy=scale_y, interpolation=cv2.INTER_LINEAR) + img2 = cv2.resize(img2, None, fx=scale_x, fy=scale_y, interpolation=cv2.INTER_LINEAR) + flow, valid = self.resize_sparse_flow_map(flow, valid, fx=scale_x, fy=scale_y) + + if self.do_flip: + if np.random.rand() < 0.5: # h-flip + img1 = img1[:, ::-1] + img2 = img2[:, ::-1] + flow = flow[:, ::-1] * [-1.0, 1.0] + valid = valid[:, ::-1] + + margin_y = 20 + margin_x = 50 + + y0 = np.random.randint(0, img1.shape[0] - self.crop_size[0] + margin_y) + x0 = np.random.randint(-margin_x, img1.shape[1] - self.crop_size[1] + margin_x) + + y0 = np.clip(y0, 0, img1.shape[0] - self.crop_size[0]) + x0 = np.clip(x0, 0, img1.shape[1] - self.crop_size[1]) + + img1 = img1[y0:y0+self.crop_size[0], x0:x0+self.crop_size[1]] + img2 = img2[y0:y0+self.crop_size[0], x0:x0+self.crop_size[1]] + flow = flow[y0:y0+self.crop_size[0], x0:x0+self.crop_size[1]] + valid = valid[y0:y0+self.crop_size[0], x0:x0+self.crop_size[1]] + return img1, img2, flow, valid + + + def __call__(self, img1, img2, flow, valid): + img1, img2 = self.color_transform(img1, img2) + img1, img2 = self.eraser_transform(img1, img2) + img1, img2, flow, valid = self.spatial_transform(img1, img2, flow, valid) + + img1 = np.ascontiguousarray(img1) + img2 = np.ascontiguousarray(img2) + flow = np.ascontiguousarray(flow) + valid = np.ascontiguousarray(valid) + + return img1, img2, flow, valid diff --git a/RAFT/utils/flow_viz.py b/RAFT/utils/flow_viz.py new file mode 100644 index 0000000..dcee65e --- /dev/null +++ b/RAFT/utils/flow_viz.py @@ -0,0 +1,132 @@ +# Flow visualization code used from https://github.com/tomrunia/OpticalFlow_Visualization + + +# MIT License +# +# Copyright (c) 2018 Tom Runia +# +# Permission is hereby granted, free of charge, to any person obtaining a copy +# of this software and associated documentation files (the "Software"), to deal +# in the Software without restriction, including without limitation the rights +# to use, copy, modify, merge, publish, distribute, sublicense, and/or sell +# copies of the Software, and to permit persons to whom the Software is +# furnished to do so, subject to conditions. +# +# Author: Tom Runia +# Date Created: 2018-08-03 + +import numpy as np + +def make_colorwheel(): + """ + Generates a color wheel for optical flow visualization as presented in: + Baker et al. "A Database and Evaluation Methodology for Optical Flow" (ICCV, 2007) + URL: http://vision.middlebury.edu/flow/flowEval-iccv07.pdf + + Code follows the original C++ source code of Daniel Scharstein. + Code follows the the Matlab source code of Deqing Sun. + + Returns: + np.ndarray: Color wheel + """ + + RY = 15 + YG = 6 + GC = 4 + CB = 11 + BM = 13 + MR = 6 + + ncols = RY + YG + GC + CB + BM + MR + colorwheel = np.zeros((ncols, 3)) + col = 0 + + # RY + colorwheel[0:RY, 0] = 255 + colorwheel[0:RY, 1] = np.floor(255*np.arange(0,RY)/RY) + col = col+RY + # YG + colorwheel[col:col+YG, 0] = 255 - np.floor(255*np.arange(0,YG)/YG) + colorwheel[col:col+YG, 1] = 255 + col = col+YG + # GC + colorwheel[col:col+GC, 1] = 255 + colorwheel[col:col+GC, 2] = np.floor(255*np.arange(0,GC)/GC) + col = col+GC + # CB + colorwheel[col:col+CB, 1] = 255 - np.floor(255*np.arange(CB)/CB) + colorwheel[col:col+CB, 2] = 255 + col = col+CB + # BM + colorwheel[col:col+BM, 2] = 255 + colorwheel[col:col+BM, 0] = np.floor(255*np.arange(0,BM)/BM) + col = col+BM + # MR + colorwheel[col:col+MR, 2] = 255 - np.floor(255*np.arange(MR)/MR) + colorwheel[col:col+MR, 0] = 255 + return colorwheel + + +def flow_uv_to_colors(u, v, convert_to_bgr=False): + """ + Applies the flow color wheel to (possibly clipped) flow components u and v. + + According to the C++ source code of Daniel Scharstein + According to the Matlab source code of Deqing Sun + + Args: + u (np.ndarray): Input horizontal flow of shape [H,W] + v (np.ndarray): Input vertical flow of shape [H,W] + convert_to_bgr (bool, optional): Convert output image to BGR. Defaults to False. + + Returns: + np.ndarray: Flow visualization image of shape [H,W,3] + """ + flow_image = np.zeros((u.shape[0], u.shape[1], 3), np.uint8) + colorwheel = make_colorwheel() # shape [55x3] + ncols = colorwheel.shape[0] + rad = np.sqrt(np.square(u) + np.square(v)) + a = np.arctan2(-v, -u)/np.pi + fk = (a+1) / 2*(ncols-1) + k0 = np.floor(fk).astype(np.int32) + k1 = k0 + 1 + k1[k1 == ncols] = 0 + f = fk - k0 + for i in range(colorwheel.shape[1]): + tmp = colorwheel[:,i] + col0 = tmp[k0] / 255.0 + col1 = tmp[k1] / 255.0 + col = (1-f)*col0 + f*col1 + idx = (rad <= 1) + col[idx] = 1 - rad[idx] * (1-col[idx]) + col[~idx] = col[~idx] * 0.75 # out of range + # Note the 2-i => BGR instead of RGB + ch_idx = 2-i if convert_to_bgr else i + flow_image[:,:,ch_idx] = np.floor(255 * col) + return flow_image + + +def flow_to_image(flow_uv, clip_flow=None, convert_to_bgr=False): + """ + Expects a two dimensional flow image of shape. + + Args: + flow_uv (np.ndarray): Flow UV image of shape [H,W,2] + clip_flow (float, optional): Clip maximum of flow values. Defaults to None. + convert_to_bgr (bool, optional): Convert output image to BGR. Defaults to False. + + Returns: + np.ndarray: Flow visualization image of shape [H,W,3] + """ + assert flow_uv.ndim == 3, 'input flow must have three dimensions' + assert flow_uv.shape[2] == 2, 'input flow must have shape [H,W,2]' + if clip_flow is not None: + flow_uv = np.clip(flow_uv, 0, clip_flow) + u = flow_uv[:,:,0] + v = flow_uv[:,:,1] + rad = np.sqrt(np.square(u) + np.square(v)) + rad_max = np.max(rad) + epsilon = 1e-5 + u = u / (rad_max + epsilon) + v = v / (rad_max + epsilon) + return flow_uv_to_colors(u, v, convert_to_bgr) \ No newline at end of file diff --git a/RAFT/utils/frame_utils.py b/RAFT/utils/frame_utils.py new file mode 100644 index 0000000..6c49113 --- /dev/null +++ b/RAFT/utils/frame_utils.py @@ -0,0 +1,137 @@ +import numpy as np +from PIL import Image +from os.path import * +import re + +import cv2 +cv2.setNumThreads(0) +cv2.ocl.setUseOpenCL(False) + +TAG_CHAR = np.array([202021.25], np.float32) + +def readFlow(fn): + """ Read .flo file in Middlebury format""" + # Code adapted from: + # http://stackoverflow.com/questions/28013200/reading-middlebury-flow-files-with-python-bytes-array-numpy + + # WARNING: this will work on little-endian architectures (eg Intel x86) only! + # print 'fn = %s'%(fn) + with open(fn, 'rb') as f: + magic = np.fromfile(f, np.float32, count=1) + if 202021.25 != magic: + print('Magic number incorrect. Invalid .flo file') + return None + else: + w = np.fromfile(f, np.int32, count=1) + h = np.fromfile(f, np.int32, count=1) + # print 'Reading %d x %d flo file\n' % (w, h) + data = np.fromfile(f, np.float32, count=2*int(w)*int(h)) + # Reshape data into 3D array (columns, rows, bands) + # The reshape here is for visualization, the original code is (w,h,2) + return np.resize(data, (int(h), int(w), 2)) + +def readPFM(file): + file = open(file, 'rb') + + color = None + width = None + height = None + scale = None + endian = None + + header = file.readline().rstrip() + if header == b'PF': + color = True + elif header == b'Pf': + color = False + else: + raise Exception('Not a PFM file.') + + dim_match = re.match(rb'^(\d+)\s(\d+)\s$', file.readline()) + if dim_match: + width, height = map(int, dim_match.groups()) + else: + raise Exception('Malformed PFM header.') + + scale = float(file.readline().rstrip()) + if scale < 0: # little-endian + endian = '<' + scale = -scale + else: + endian = '>' # big-endian + + data = np.fromfile(file, endian + 'f') + shape = (height, width, 3) if color else (height, width) + + data = np.reshape(data, shape) + data = np.flipud(data) + return data + +def writeFlow(filename,uv,v=None): + """ Write optical flow to file. + + If v is None, uv is assumed to contain both u and v channels, + stacked in depth. + Original code by Deqing Sun, adapted from Daniel Scharstein. + """ + nBands = 2 + + if v is None: + assert(uv.ndim == 3) + assert(uv.shape[2] == 2) + u = uv[:,:,0] + v = uv[:,:,1] + else: + u = uv + + assert(u.shape == v.shape) + height,width = u.shape + f = open(filename,'wb') + # write the header + f.write(TAG_CHAR) + np.array(width).astype(np.int32).tofile(f) + np.array(height).astype(np.int32).tofile(f) + # arrange into matrix form + tmp = np.zeros((height, width*nBands)) + tmp[:,np.arange(width)*2] = u + tmp[:,np.arange(width)*2 + 1] = v + tmp.astype(np.float32).tofile(f) + f.close() + + +def readFlowKITTI(filename): + flow = cv2.imread(filename, cv2.IMREAD_ANYDEPTH|cv2.IMREAD_COLOR) + flow = flow[:,:,::-1].astype(np.float32) + flow, valid = flow[:, :, :2], flow[:, :, 2] + flow = (flow - 2**15) / 64.0 + return flow, valid + +def readDispKITTI(filename): + disp = cv2.imread(filename, cv2.IMREAD_ANYDEPTH) / 256.0 + valid = disp > 0.0 + flow = np.stack([-disp, np.zeros_like(disp)], -1) + return flow, valid + + +def writeFlowKITTI(filename, uv): + uv = 64.0 * uv + 2**15 + valid = np.ones([uv.shape[0], uv.shape[1], 1]) + uv = np.concatenate([uv, valid], axis=-1).astype(np.uint16) + cv2.imwrite(filename, uv[..., ::-1]) + + +def read_gen(file_name, pil=False): + ext = splitext(file_name)[-1] + if ext == '.png' or ext == '.jpeg' or ext == '.ppm' or ext == '.jpg': + return Image.open(file_name) + elif ext == '.bin' or ext == '.raw': + return np.load(file_name) + elif ext == '.flo': + return readFlow(file_name).astype(np.float32) + elif ext == '.pfm': + flow = readPFM(file_name).astype(np.float32) + if len(flow.shape) == 2: + return flow + else: + return flow[:, :, :-1] + return [] \ No newline at end of file diff --git a/RAFT/utils/utils.py b/RAFT/utils/utils.py new file mode 100644 index 0000000..741ccfe --- /dev/null +++ b/RAFT/utils/utils.py @@ -0,0 +1,82 @@ +import torch +import torch.nn.functional as F +import numpy as np +from scipy import interpolate + + +class InputPadder: + """ Pads images such that dimensions are divisible by 8 """ + def __init__(self, dims, mode='sintel'): + self.ht, self.wd = dims[-2:] + pad_ht = (((self.ht // 8) + 1) * 8 - self.ht) % 8 + pad_wd = (((self.wd // 8) + 1) * 8 - self.wd) % 8 + if mode == 'sintel': + self._pad = [pad_wd//2, pad_wd - pad_wd//2, pad_ht//2, pad_ht - pad_ht//2] + else: + self._pad = [pad_wd//2, pad_wd - pad_wd//2, 0, pad_ht] + + def pad(self, *inputs): + return [F.pad(x, self._pad, mode='replicate') for x in inputs] + + def unpad(self,x): + ht, wd = x.shape[-2:] + c = [self._pad[2], ht-self._pad[3], self._pad[0], wd-self._pad[1]] + return x[..., c[0]:c[1], c[2]:c[3]] + +def forward_interpolate(flow): + flow = flow.detach().cpu().numpy() + dx, dy = flow[0], flow[1] + + ht, wd = dx.shape + x0, y0 = np.meshgrid(np.arange(wd), np.arange(ht)) + + x1 = x0 + dx + y1 = y0 + dy + + x1 = x1.reshape(-1) + y1 = y1.reshape(-1) + dx = dx.reshape(-1) + dy = dy.reshape(-1) + + valid = (x1 > 0) & (x1 < wd) & (y1 > 0) & (y1 < ht) + x1 = x1[valid] + y1 = y1[valid] + dx = dx[valid] + dy = dy[valid] + + flow_x = interpolate.griddata( + (x1, y1), dx, (x0, y0), method='nearest', fill_value=0) + + flow_y = interpolate.griddata( + (x1, y1), dy, (x0, y0), method='nearest', fill_value=0) + + flow = np.stack([flow_x, flow_y], axis=0) + return torch.from_numpy(flow).float() + + +def bilinear_sampler(img, coords, mode='bilinear', mask=False): + """ Wrapper for grid_sample, uses pixel coordinates """ + H, W = img.shape[-2:] + xgrid, ygrid = coords.split([1,1], dim=-1) + xgrid = 2*xgrid/(W-1) - 1 + ygrid = 2*ygrid/(H-1) - 1 + + grid = torch.cat([xgrid, ygrid], dim=-1) + img = F.grid_sample(img, grid, align_corners=True) + + if mask: + mask = (xgrid > -1) & (ygrid > -1) & (xgrid < 1) & (ygrid < 1) + return img, mask.float() + + return img + + +def coords_grid(batch, ht, wd, device): + coords = torch.meshgrid(torch.arange(ht, device=device), torch.arange(wd, device=device)) + coords = torch.stack(coords[::-1], dim=0).float() + return coords[None].repeat(batch, 1, 1, 1) + + +def upflow8(flow, mode='bilinear'): + new_size = (8 * flow.shape[2], 8 * flow.shape[3]) + return 8 * F.interpolate(flow, size=new_size, mode=mode, align_corners=True)