def forward(self, inputs):
"""
Get SOLOv2MaskHead output.
Args:
inputs(list[Tensor]): feature map from each necks with shape of [N, C, H, W]
Returns:
ins_pred(Tensor): Output of SOLOv2MaskHead head
"""
feat_all_level = F.relu(self.convs_all_levels[0](inputs[0]))
for i in range(1, self.range_level):
input_p = inputs[i]
if i == (self.range_level - 1):
input_feat = input_p
x_range = paddle.linspace(
-1, 1, paddle.shape(input_feat)[-1], dtype='float32')
y_range = paddle.linspace(
-1, 1, paddle.shape(input_feat)[-2], dtype='float32')
y, x = paddle.meshgrid([y_range, x_range])
x = paddle.unsqueeze(x, [0, 1])
y = paddle.unsqueeze(y, [0, 1])
y = paddle.expand(
y, shape=[paddle.shape(input_feat)[0], 1, -1, -1])
x = paddle.expand(
x, shape=[paddle.shape(input_feat)[0], 1, -1, -1])
coord_feat = paddle.concat([x, y], axis=1)
input_p = paddle.concat([input_p, coord_feat], axis=1)
feat_all_level = paddle.add(feat_all_level,
self.convs_all_levels[i](input_p))
ins_pred = F.relu(self.conv_pred(feat_all_level))
return ins_pred
def get_output_and_grid(self, output, k, stride):
grid = self.grids[k]
batch_size = output.shape[0]
n_ch = 5 + self.num_classes
hsize, wsize = output.shape[-2:]
if grid.shape[2:4] != output.shape[2:4]:
yv, xv = paddle.meshgrid(
[paddle.arange(hsize),
paddle.arange(wsize)])
grid = paddle.stack((xv, yv), 2)
grid = paddle.reshape(grid, (1, 1, hsize, wsize, 2))
grid = paddle.cast(grid, dtype=output.dtype)
self.grids[k] = grid
output = paddle.reshape(
output, (batch_size, self.n_anchors, n_ch, hsize, wsize))
output = paddle.transpose(output, [0, 1, 3, 4, 2])
output = paddle.reshape(output,
(batch_size, self.n_anchors * hsize * wsize,
-1)) # [N, 1 * 80 * 80, 85]
grid = paddle.reshape(grid, (1, -1, 2)) # [1, 1 * 80 * 80, 2]
xy = (output[:, :, :2] + grid) * stride # [N, 1 * 80 * 80, 2] xy解码
wh = paddle.exp(output[:, :,
2:4]) * stride # [N, 1 * 80 * 80, 2] wh解码
output = paddle.concat([xy, wh, output[:, :, 4:]],
2) # [N, 1 * 80 * 80, 85] 解码后的xywh放回output里面
return output, grid
def __init__(self, channels, scale):
super(AntiAliasInterpolation2d, self).__init__()
sigma = (1 / scale - 1) / 2
kernel_size = 2 * round(sigma * 4) + 1
self.ka = kernel_size // 2
self.kb = self.ka - 1 if kernel_size % 2 == 0 else self.ka
kernel_size = [kernel_size, kernel_size]
sigma = [sigma, sigma]
# The gaussian kernel is the product of the
# gaussian function of each dimension.
kernel = 1
meshgrids = paddle.meshgrid(
[paddle.arange(size, dtype='float32') for size in kernel_size])
for size, std, mgrid in zip(kernel_size, sigma, meshgrids):
mean = (size - 1) / 2
kernel *= paddle.exp(-(mgrid - mean)**2 / (2 * std**2 + 1e-9))
# Make sure sum of values in gaussian kernel equals 1.
kernel = kernel / paddle.sum(kernel)
# Reshape to depthwise convolutional weight
kernel = kernel.reshape([1, 1, *kernel.shape])
kernel = paddle.tile(kernel, [channels, *[1] * (kernel.dim() - 1)])
self.register_buffer('weight', kernel)
self.groups = channels
self.scale = scale
def rand_cutout(x, ratio=0.5):
cutout_size = int(x.shape[2] * ratio + 0.5), int(x.shape[3] * ratio + 0.5)
offset_x = paddle.randint(0,
x.shape[2] + (1 - cutout_size[0] % 2),
shape=[x.shape[0], 1, 1])
offset_y = paddle.randint(0,
x.shape[3] + (1 - cutout_size[1] % 2),
shape=[x.shape[0], 1, 1])
# TODO: Current version paddle doesn't support int64 Tensors indices
# grid_batch, grid_x, grid_y = paddle.meshgrid(
# paddle.arange(x.shape[0], dtype='int64'),
# paddle.arange(cutout_size[0], dtype='int64'),
# paddle.arange(cutout_size[1], dtype='int64'),
# )
# grid_x = paddle.clip((grid_x + offset_x - cutout_size[0] // 2).astype(x.dtype), min=0, max=x.shape[2] - 1).astype('int64')
# grid_y = paddle.clip((grid_y + offset_y - cutout_size[1] // 2).astype(x.dtype), min=0, max=x.shape[3] - 1).astype('int64')
# mask = paddle.ones([x.shape[0], x.shape[2], x.shape[3]], dtype=x.dtype)
# mask[grid_batch, grid_x, grid_y] = 0
grid_batch, grid_x, grid_y = paddle.meshgrid(
paddle.arange(x.shape[0], dtype='int64'),
paddle.arange(x.shape[2], dtype='int64'),
paddle.arange(x.shape[3], dtype='int64'),
)
grid_x = grid_x + offset_x - cutout_size[0] // 2
grid_y = grid_y + offset_y - cutout_size[1] // 2
mask = 1 - ((grid_x >= 0).astype(x.dtype) *
(grid_x < cutout_size[0]).astype(x.dtype) *
(grid_y >= 0).astype(x.dtype) *
(grid_y < cutout_size[1]).astype(x.dtype)).astype(x.dtype)
x = x * mask.unsqueeze(1).detach()
return x
def rand_translation(x, ratio=0.125):
shift_x, shift_y = int(x.shape[2] * ratio + 0.5), int(x.shape[3] * ratio +
0.5)
translation_x = paddle.randint(-shift_x,
shift_x + 1,
shape=[x.shape[0], 1, 1])
translation_y = paddle.randint(-shift_y,
shift_y + 1,
shape=[x.shape[0], 1, 1])
grid_batch, grid_x, grid_y = paddle.meshgrid(
paddle.arange(x.shape[0], dtype='int64'),
paddle.arange(x.shape[2], dtype='int64'),
paddle.arange(x.shape[3], dtype='int64'),
)
grid_x = paddle.clip((grid_x + translation_x + 1).astype(x.dtype), 0,
x.shape[2] + 1).astype('int64')
grid_y = paddle.clip((grid_y + translation_y + 1).astype(x.dtype), 0,
x.shape[3] + 1).astype('int64')
x_pad = F.pad(x, [1, 1, 1, 1])
# TODO: Current version paddle doesn't support int64 Tensors indices
# x = x_pad.transpose([0, 2, 3, 1])[grid_batch, grid_x, grid_y].transpose([0, 3, 1, 2])
indices = paddle.stack([grid_batch, grid_x, grid_y], -1)
x = x_pad.transpose([0, 2, 3,
1]).gather_nd(indices).transpose([0, 3, 1, 2])
return x
def __init__(self, dim, window_size, num_heads, qkv_bias=True, qk_scale=None, attn_drop=0., proj_drop=0.):
super().__init__()
self.dim = dim
self.window_size = window_size # Wh, Ww
self.num_heads = num_heads
head_dim = dim // num_heads
self.scale = qk_scale or head_dim ** -0.5
# define a parameter table of relative position bias
relative_position_bias_table = self.create_parameter(
shape=((2 * window_size[0] - 1) * (2 * window_size[1] - 1), num_heads), default_initializer=nn.initializer.Constant(value=0)) # 2*Wh-1 * 2*Ww-1, nH
self.add_parameter("relative_position_bias_table", relative_position_bias_table)
# get pair-wise relative position index for each token inside the window
coords_h = paddle.arange(self.window_size[0])
coords_w = paddle.arange(self.window_size[1])
coords = paddle.stack(paddle.meshgrid([coords_h, coords_w])) # 2, Wh, Ww
coords_flatten = paddle.flatten(coords, 1) # 2, Wh*Ww
relative_coords = coords_flatten.unsqueeze(-1) - coords_flatten.unsqueeze(1) # 2, Wh*Ww, Wh*Ww
relative_coords = relative_coords.transpose([1, 2, 0]) # Wh*Ww, Wh*Ww, 2
relative_coords[:, :, 0] += self.window_size[0] - 1 # shift to start from 0
relative_coords[:, :, 1] += self.window_size[1] - 1
relative_coords[:, :, 0] *= 2 * self.window_size[1] - 1
self.relative_position_index = relative_coords.sum(-1) # Wh*Ww, Wh*Ww
self.register_buffer("relative_position_index", self.relative_position_index)
self.qkv = nn.Linear(dim, dim * 3, bias_attr=qkv_bias)
self.attn_drop = nn.Dropout(attn_drop)
self.proj = nn.Linear(dim, dim)
self.proj_drop = nn.Dropout(proj_drop)
self.softmax = nn.Softmax(axis=-1)
def _meshgrid(self, x, y, row_major=True):
yy, xx = paddle.meshgrid(y, x)
yy = yy.reshape([-1])
xx = xx.reshape([-1])
if row_major:
return xx, yy
else:
return yy, xx
def _create_grid_offsets(self, size, stride, offset):
grid_height, grid_width = size[0], size[1]
shifts_x = paddle.arange(
offset * stride, grid_width * stride, step=stride, dtype='float32')
shifts_y = paddle.arange(
offset * stride, grid_height * stride, step=stride, dtype='float32')
shift_y, shift_x = paddle.meshgrid(shifts_y, shifts_x)
shift_x = paddle.reshape(shift_x, [-1])
shift_y = paddle.reshape(shift_y, [-1])
return shift_x, shift_y
def build_P_paddle(self, I_r_size):
I_r_height, I_r_width = I_r_size
I_r_grid_x = (paddle.arange(-I_r_width, I_r_width, 2).astype('float32')
+ 1.0) / I_r_width # self.I_r_width
I_r_grid_y = (
paddle.arange(-I_r_height, I_r_height, 2).astype('float32') +
1.0) / I_r_height # self.I_r_height
# P: self.I_r_width x self.I_r_height x 2
P = paddle.stack(paddle.meshgrid(I_r_grid_x, I_r_grid_y), axis=2)
P = paddle.transpose(P, perm=[1, 0, 2])
# n (= self.I_r_width x self.I_r_height) x 2
return P.reshape([-1, 2])
def build_P_paddle(self, I_r_size):
I_r_width, I_r_height = I_r_size
I_r_grid_x = paddle.divide(
(paddle.arange(-I_r_width, I_r_width, 2).astype('float32') + 1.0),
paddle.to_tensor(I_r_width).astype('float32'))
I_r_grid_y = paddle.divide(
(paddle.arange(-I_r_height, I_r_height, 2).astype('float32') +
1.0),
paddle.to_tensor(I_r_height).astype('float32'))
P = paddle.stack(paddle.meshgrid(I_r_grid_x, I_r_grid_y), axis=2)
P = paddle.transpose(P, perm=[1, 0, 2])
return P.reshape([-1, 2])
def get_coord_features(self, points, batchsize, rows, cols):
if self.cpu_mode:
coords = []
for i in range(batchsize):
norm_delimeter = (1.0 if self.use_disks else
self.spatial_scale * self.norm_radius)
coords.append(
self._get_dist_maps(points[i].numpy().astype("float32"),
rows, cols, norm_delimeter))
coords = paddle.to_tensor(np.stack(coords,
axis=0)).astype("float32")
else:
num_points = points.shape[1] // 2
points = points.reshape([-1, points.shape[2]])
points, points_order = paddle.split(points, [2, 1], axis=1)
invalid_points = paddle.max(points, axis=1, keepdim=False) < 0
row_array = paddle.arange(start=0,
end=rows,
step=1,
dtype="float32")
col_array = paddle.arange(start=0,
end=cols,
step=1,
dtype="float32")
coord_rows, coord_cols = paddle.meshgrid(row_array, col_array)
coords = paddle.unsqueeze(paddle.stack([coord_rows, coord_cols],
axis=0),
axis=0).tile([points.shape[0], 1, 1, 1])
add_xy = (points * self.spatial_scale).reshape(
[points.shape[0], points.shape[1], 1, 1])
coords = coords - add_xy
if not self.use_disks:
coords = coords / (self.norm_radius * self.spatial_scale)
coords = coords * coords
coords[:, 0] += coords[:, 1]
coords = coords[:, :1]
invalid_points = invalid_points.numpy()
coords[invalid_points, :, :, :] = 1e6
coords = coords.reshape([-1, num_points, 1, rows, cols])
coords = paddle.min(coords, axis=1)
coords = coords.reshape([-1, 2, rows, cols])
if self.use_disks:
coords = (coords <= (self.norm_radius * self.spatial_scale)**
2).astype("float32")
else:
coords = paddle.tanh(paddle.sqrt(coords) * 2)
return coords
def get_reference_points(spatial_shapes, valid_ratios):
valid_ratios = valid_ratios.unsqueeze(1)
reference_points = []
for i, (H, W) in enumerate(spatial_shapes.tolist()):
ref_y, ref_x = paddle.meshgrid(paddle.linspace(0.5, H - 0.5, H),
paddle.linspace(0.5, W - 0.5, W))
ref_y = ref_y.flatten().unsqueeze(0) / (valid_ratios[:, :, i, 1] *
H)
ref_x = ref_x.flatten().unsqueeze(0) / (valid_ratios[:, :, i, 0] *
W)
reference_points.append(paddle.stack((ref_x, ref_y), axis=-1))
reference_points = paddle.concat(reference_points, 1).unsqueeze(2)
reference_points = reference_points * valid_ratios
return reference_points
def build_P_paddle(self, I_r_size):
I_r_height, I_r_width = I_r_size
I_r_grid_x = (paddle.arange(-I_r_width, I_r_width, 2, dtype='float64')
+ 1.0) / paddle.to_tensor(np.array([I_r_width]))
I_r_grid_y = (
paddle.arange(-I_r_height, I_r_height, 2, dtype='float64') +
1.0) / paddle.to_tensor(np.array([I_r_height]))
# P: self.I_r_width x self.I_r_height x 2
P = paddle.stack(paddle.meshgrid(I_r_grid_x, I_r_grid_y), axis=2)
P = paddle.transpose(P, perm=[1, 0, 2])
# n (= self.I_r_width x self.I_r_height) x 2
return P.reshape([-1, 2])
def generate_anchors_for_grid_cell(feats,
fpn_strides,
grid_cell_size=5.0,
grid_cell_offset=0.5):
r"""
Like ATSS, generate anchors based on grid size.
Args:
feats (List[Tensor]): shape[s, (b, c, h, w)]
fpn_strides (tuple|list): shape[s], stride for each scale feature
grid_cell_size (float): anchor size
grid_cell_offset (float): The range is between 0 and 1.
Returns:
anchors (Tensor): shape[l, 4], "xmin, ymin, xmax, ymax" format.
anchor_points (Tensor): shape[l, 2], "x, y" format.
num_anchors_list (List[int]): shape[s], contains [s_1, s_2, ...].
stride_tensor (Tensor): shape[l, 1], contains the stride for each scale.
"""
assert len(feats) == len(fpn_strides)
anchors = []
anchor_points = []
num_anchors_list = []
stride_tensor = []
for feat, stride in zip(feats, fpn_strides):
_, _, h, w = feat.shape
cell_half_size = grid_cell_size * stride * 0.5
shift_x = (paddle.arange(end=w) + grid_cell_offset) * stride
shift_y = (paddle.arange(end=h) + grid_cell_offset) * stride
shift_y, shift_x = paddle.meshgrid(shift_y, shift_x)
anchor = paddle.stack([
shift_x - cell_half_size, shift_y - cell_half_size,
shift_x + cell_half_size, shift_y + cell_half_size
],
axis=-1).astype(feat.dtype)
anchor_point = paddle.stack([shift_x, shift_y],
axis=-1).astype(feat.dtype)
anchors.append(anchor.reshape([-1, 4]))
anchor_points.append(anchor_point.reshape([-1, 2]))
num_anchors_list.append(len(anchors[-1]))
stride_tensor.append(
paddle.full([num_anchors_list[-1], 1], stride, dtype=feat.dtype))
anchors = paddle.concat(anchors)
anchors.stop_gradient = True
anchor_points = paddle.concat(anchor_points)
anchor_points.stop_gradient = True
stride_tensor = paddle.concat(stride_tensor)
stride_tensor.stop_gradient = True
return anchors, anchor_points, num_anchors_list, stride_tensor
def _get_output_single(self, input, idx):
ins_kernel_feat = input
# CoordConv
x_range = paddle.linspace(-1,
1,
paddle.shape(ins_kernel_feat)[-1],
dtype='float32')
y_range = paddle.linspace(-1,
1,
paddle.shape(ins_kernel_feat)[-2],
dtype='float32')
y, x = paddle.meshgrid([y_range, x_range])
x = paddle.unsqueeze(x, [0, 1])
y = paddle.unsqueeze(y, [0, 1])
y = paddle.expand(y,
shape=[paddle.shape(ins_kernel_feat)[0], 1, -1, -1])
x = paddle.expand(x,
shape=[paddle.shape(ins_kernel_feat)[0], 1, -1, -1])
coord_feat = paddle.concat([x, y], axis=1)
ins_kernel_feat = paddle.concat([ins_kernel_feat, coord_feat], axis=1)
# kernel branch
kernel_feat = ins_kernel_feat
seg_num_grid = self.seg_num_grids[idx]
kernel_feat = F.interpolate(kernel_feat,
size=[seg_num_grid, seg_num_grid],
mode='bilinear',
align_corners=False,
align_mode=0)
cate_feat = kernel_feat[:, :-2, :, :]
for kernel_layer in self.kernel_pred_convs:
kernel_feat = F.relu(kernel_layer(kernel_feat))
if self.drop_block and self.training:
kernel_feat = self.drop_block_fun(kernel_feat)
kernel_pred = self.solo_kernel(kernel_feat)
# cate branch
for cate_layer in self.cate_pred_convs:
cate_feat = F.relu(cate_layer(cate_feat))
if self.drop_block and self.training:
cate_feat = self.drop_block_fun(cate_feat)
cate_pred = self.solo_cate(cate_feat)
if not self.training:
cate_pred = self._points_nms(F.sigmoid(cate_pred), kernel_size=2)
cate_pred = paddle.transpose(cate_pred, [0, 2, 3, 1])
return cate_pred, kernel_pred
def dft_matrix(n: int,
return_complex: bool = False,
dtype: str = 'float64') -> Tensor:
"""Compute discrete Fourier transform matrix.
Parameters:
n(int): the size of dft matrix.
return_complex(bool): whether to return complex matrix. If True, the matrix will
be complex type. Otherwise, the real and image part will be stored in the last
axis of returned tensor.
dtype(str): the datatype of the returned dft matrix.
Shape:
output: [n, n] or [n,n,2]
Returns:
Complex tensor of shape (n,n) if return_complex=True, and of shape (n,n,2) otherwise.
Examples:
.. code-block:: python
import paddle
import paddleaudio.functional as F
m = F.dft_matrix(512)
print(m.shape)
>> [512, 512, 2]
m = F.dft_matrix(512, return_complex=True)
print(m.shape)
>> [512, 512]
"""
# This is due to a bug in paddle in lacking support for complex128, as of paddle 2.1.0
if return_complex and dtype == 'float64':
raise ValueError('not implemented')
x, y = paddle.meshgrid(paddle.arange(0, n), paddle.arange(0, n))
z = x.astype(dtype) * y.astype(dtype) * paddle.to_tensor(
(-2 * math.pi / n), dtype)
cos = paddle.cos(z)
sin = paddle.sin(z)
if return_complex:
return cos + paddle.to_tensor([1j]) * sin
cos = cos.unsqueeze(-1)
sin = sin.unsqueeze(-1)
return paddle.concat([cos, sin], -1)
def get_single_level_center_point(self, featmap_size, stride,
cell_offset=0):
"""
Generate pixel centers of a single stage feature map.
Args:
featmap_size: height and width of the feature map
stride: down sample stride of the feature map
Returns:
y and x of the center points
"""
h, w = featmap_size
x_range = (paddle.arange(w, dtype='float32') + cell_offset) * stride
y_range = (paddle.arange(h, dtype='float32') + cell_offset) * stride
y, x = paddle.meshgrid(y_range, x_range)
y = y.flatten()
x = x.flatten()
return y, x
def generate_anchor(self, nGh, nGw, anchor_wh):
nA = len(anchor_wh)
yv, xv = paddle.meshgrid([paddle.arange(nGh), paddle.arange(nGw)])
mesh = paddle.stack((xv, yv),
axis=0).cast(dtype='float32') # 2 x nGh x nGw
meshs = paddle.tile(mesh, [nA, 1, 1, 1])
anchor_offset_mesh = anchor_wh[:, :, None][:, :, :, None].repeat(
int(nGh), axis=-2).repeat(int(nGw), axis=-1)
anchor_offset_mesh = paddle.to_tensor(
anchor_offset_mesh.astype(np.float32))
# nA x 2 x nGh x nGw
anchor_mesh = paddle.concat([meshs, anchor_offset_mesh], axis=1)
anchor_mesh = paddle.transpose(anchor_mesh,
[0, 2, 3, 1]) # (nA x nGh x nGw) x 4
return anchor_mesh
def _generate_anchors(self, feats):
anchors, num_anchors_list = [], []
stride_tensor_list = []
for feat, stride in zip(feats, self.fpn_strides):
_, _, h, w = feat.shape
cell_half_size = self.grid_cell_scale * stride * 0.5
shift_x = (paddle.arange(end=w) + self.grid_cell_offset) * stride
shift_y = (paddle.arange(end=h) + self.grid_cell_offset) * stride
shift_y, shift_x = paddle.meshgrid(shift_y, shift_x)
anchor = paddle.stack([
shift_x - cell_half_size, shift_y - cell_half_size,
shift_x + cell_half_size, shift_y + cell_half_size
],
axis=-1)
anchors.append(anchor.reshape([-1, 4]))
num_anchors_list.append(len(anchors[-1]))
stride_tensor_list.append(
paddle.full([num_anchors_list[-1], 1], stride))
return anchors, num_anchors_list, stride_tensor_list
def _generate_anchor_point(self, feat_sizes, strides, offset=0.):
anchor_points, stride_tensor = [], []
num_anchors_list = []
for feat_size, stride in zip(feat_sizes, strides):
h, w = feat_size
x = (paddle.arange(w) + offset) * stride
y = (paddle.arange(h) + offset) * stride
y, x = paddle.meshgrid(y, x)
anchor_points.append(
paddle.stack([x, y], axis=-1).reshape([-1, 2]))
stride_tensor.append(
paddle.full([len(anchor_points[-1]), 1],
stride,
dtype=self._dtype))
num_anchors_list.append(len(anchor_points[-1]))
anchor_points = paddle.concat(anchor_points).astype(self._dtype)
anchor_points.stop_gradient = True
stride_tensor = paddle.concat(stride_tensor)
stride_tensor.stop_gradient = True
return anchor_points, stride_tensor, num_anchors_list
def decode_outputs(self, outputs):
grids = []
strides = []
for (hsize, wsize), stride in zip(self.hw, self.strides):
yv, xv = paddle.meshgrid(
[paddle.arange(hsize),
paddle.arange(wsize)])
grid = paddle.reshape(paddle.stack((xv, yv), 2), (1, -1, 2))
grids.append(grid)
shape = grid.shape[:2]
strides.append(paddle.full((*shape, 1), stride))
grids = paddle.concat(grids, axis=1)
strides = paddle.concat(strides, axis=1)
grids = paddle.cast(grids, outputs.dtype)
strides = paddle.cast(strides, outputs.dtype)
outputs[:, :, :2] = (outputs[:, :, :2] + grids) * strides
outputs[:, :, 2:4] = paddle.exp(outputs[:, :, 2:4]) * strides
return outputs
def test_api_with_dygraph_list_input(self):
paddle.disable_static(paddle.NPUPlace(0))
input_3 = np.random.randint(0, 100, [
100,
]).astype('int32')
input_4 = np.random.randint(0, 100, [
200,
]).astype('int32')
out_3 = np.reshape(input_3, [100, 1])
out_3 = np.broadcast_to(out_3, [100, 200])
out_4 = np.reshape(input_4, [1, 200])
out_4 = np.broadcast_to(out_4, [100, 200])
tensor_3 = paddle.to_tensor(input_3)
tensor_4 = paddle.to_tensor(input_4)
res_3, res_4 = paddle.meshgrid([tensor_3, tensor_4])
self.assertTrue(np.allclose(res_3.numpy(), out_3))
self.assertTrue(np.allclose(res_4.numpy(), out_4))
paddle.enable_static()
def masks_to_boxes(masks):
"""Compute the bounding boxes around the provided masks
The masks should be in format [N, H, W] where N is the number of masks, (H, W) are the spatial dimensions.
Returns a [N, 4] tensors, with the boxes in xyxy format
"""
if masks.numel() == 0:
return paddle.zeros((0, 4)).requires_grad_(False)
h, w = masks.shape[-2:]
y = paddle.arange(0, h, dtype='float32').requires_grad_(False)
x = paddle.arange(0, w, dtype='float32').requires_grad_(False)
y, x = paddle.meshgrid(y, x)
x_mask = masks * x.unsqueeze(0)
x_max = x_mask.flatten(1).max(-1)[0]
x_min = x_mask.masked_fill(~masks.bool(), 100000000.0).flatten(1).min(-1)[0
]
y_mask = masks * y.unsqueeze(0)
y_max = y_mask.flatten(1).max(-1)[0]
y_min = y_mask.masked_fill(~masks.bool(), 100000000.0).flatten(1).min(-1)[0
]
return paddle.stacks([x_min, y_min, x_max, y_max], 1)
def _generate_anchors(self, feats=None):
# just use in eval time
anchor_points = []
stride_tensor = []
for i, stride in enumerate(self.fpn_stride):
if feats is not None:
_, _, h, w = feats[i].shape
else:
h = math.ceil(self.eval_size[0] / stride)
w = math.ceil(self.eval_size[1] / stride)
shift_x = paddle.arange(end=w) + self.cell_offset
shift_y = paddle.arange(end=h) + self.cell_offset
shift_y, shift_x = paddle.meshgrid(shift_y, shift_x)
anchor_point = paddle.cast(
paddle.stack(
[shift_x, shift_y], axis=-1), dtype='float32')
anchor_points.append(anchor_point.reshape([-1, 2]))
stride_tensor.append(
paddle.full(
[h * w, 1], stride, dtype='float32'))
anchor_points = paddle.concat(anchor_points)
stride_tensor = paddle.concat(stride_tensor)
return anchor_points, stride_tensor
def __init__(self, channels, scale):
super(AntiAliasInterpolation2d, self).__init__()
sigma = (1 / scale - 1) / 2
kernel_size = 2 * round(sigma * 4) + 1
self.ka = kernel_size // 2
self.kb = self.ka - 1 if kernel_size % 2 == 0 else self.ka
kernel_size = [kernel_size, kernel_size]
sigma = [sigma, sigma]
# The gaussian kernel is the product of the
# gaussian function of each dimension.
kernel = 1
meshgrids = paddle.meshgrid(
[paddle.arange(size, dtype='float32') for size in kernel_size])
for size, std, mgrid in zip(kernel_size, sigma, meshgrids):
mean = (size - 1) / 2
kernel *= paddle.exp(-(mgrid - mean)**2 / (2 * std**2 + 1e-9))
# Make sure sum of values in gaussian kernel equals 1.
kernel = kernel / paddle.sum(kernel)
# Reshape to depthwise convolutional weight
kernel = kernel.reshape((1, 1, *kernel.shape))
kernel = kernel.tile(
(channels, *((1, ) * (len(kernel.shape) - 1))
)) # [1, 1, *kernel.shape] -> [channels, 1, *kernel.shape]
self.kernel_attr = paddle.ParamAttr(
initializer=paddle.nn.initializer.Assign(kernel), trainable=False)
self.groups = channels
self.scale = scale
self.conv = nn.Conv2D(channels,
channels,
kernel_size=kernel.shape[-1],
groups=self.groups,
weight_attr=self.kernel_attr,
bias_attr=False)
self.conv.weight.set_value(kernel)
def forward(self, inputs, _inputs, _input):
"""
forward
"""
x, y, z = paddle.meshgrid([inputs, _inputs, _input])
return x + y + z
def forward(self, inputs, _inputs):
"""
forward
"""
x, y = paddle.meshgrid([inputs, _inputs])
return x + y
def make_grid(h, w, dtype):
yv, xv = paddle.meshgrid([paddle.arange(h), paddle.arange(w)])
return paddle.stack((xv, yv), 2).cast(dtype=dtype)
def get_offset(self, anchors, featmap_size, stride):
"""
Args:
anchors: [M,5] xc,yc,w,h,angle
featmap_size: (feat_h, feat_w)
stride: 8
Returns:
"""
anchors = paddle.reshape(anchors, [-1, 5]) # (NA,5)
dtype = anchors.dtype
feat_h = featmap_size[0]
feat_w = featmap_size[1]
pad = (self.kernel_size - 1) // 2
idx = paddle.arange(-pad, pad + 1, dtype=dtype)
yy, xx = paddle.meshgrid(idx, idx)
xx = paddle.reshape(xx, [-1])
yy = paddle.reshape(yy, [-1])
# get sampling locations of default conv
xc = paddle.arange(0, feat_w, dtype=dtype)
yc = paddle.arange(0, feat_h, dtype=dtype)
yc, xc = paddle.meshgrid(yc, xc)
xc = paddle.reshape(xc, [-1, 1])
yc = paddle.reshape(yc, [-1, 1])
x_conv = xc + xx
y_conv = yc + yy
# get sampling locations of anchors
# x_ctr, y_ctr, w, h, a = np.unbind(anchors, dim=1)
x_ctr = anchors[:, 0]
y_ctr = anchors[:, 1]
w = anchors[:, 2]
h = anchors[:, 3]
a = anchors[:, 4]
x_ctr = paddle.reshape(x_ctr, [-1, 1])
y_ctr = paddle.reshape(y_ctr, [-1, 1])
w = paddle.reshape(w, [-1, 1])
h = paddle.reshape(h, [-1, 1])
a = paddle.reshape(a, [-1, 1])
x_ctr = x_ctr / stride
y_ctr = y_ctr / stride
w_s = w / stride
h_s = h / stride
cos, sin = paddle.cos(a), paddle.sin(a)
dw, dh = w_s / self.kernel_size, h_s / self.kernel_size
x, y = dw * xx, dh * yy
xr = cos * x - sin * y
yr = sin * x + cos * y
x_anchor, y_anchor = xr + x_ctr, yr + y_ctr
# get offset filed
offset_x = x_anchor - x_conv
offset_y = y_anchor - y_conv
offset = paddle.stack([offset_y, offset_x], axis=-1)
offset = paddle.reshape(
offset, [feat_h * feat_w, self.kernel_size * self.kernel_size * 2])
offset = paddle.transpose(offset, [1, 0])
offset = paddle.reshape(
offset,
[1, self.kernel_size * self.kernel_size * 2, feat_h, feat_w])
return offset
def forward(self, x, offset, mask):
in_C = self.in_channels
out_C = self.out_channels
stride = self.stride
padding = self.padding
# dilation = self.dilation
groups = self.groups
N, _, H, W = x.shape
_, w_in, kH, kW = self.weight.shape
out_W = (W + 2 * padding - (kW - 1)) // stride
out_H = (H + 2 * padding - (kH - 1)) // stride
# ================== 1.先对图片x填充得到填充后的图片pad_x ==================
pad_x_H = H + padding * 2 + 1
pad_x_W = W + padding * 2 + 1
pad_x = F.pad(x, pad=[0, 0, 0, 0, padding, padding + 1, padding, padding + 1], value=0.0)
# ================== 2.求所有采样点的坐标 ==================
# 卷积核中心点在pad_x中的位置
y_outer, x_outer = paddle.meshgrid([paddle.arange(out_H), paddle.arange(out_W)])
y_outer = y_outer * stride + padding
x_outer = x_outer * stride + padding
start_pos_yx = paddle.stack((y_outer, x_outer), 2).cast(dtype='float32') # [out_H, out_W, 2] 仅仅是卷积核中心点在pad_x中的位置
start_pos_yx = paddle.unsqueeze(start_pos_yx, axis=[0, 3]) # [1, out_H, out_W, 1, 2] 仅仅是卷积核中心点在pad_x中的位置
start_pos_yx = paddle.tile(start_pos_yx, [N, 1, 1, kH * kW, 1]) # [N, out_H, out_W, kH*kW, 2] 仅仅是卷积核中心点在pad_x中的位置
start_pos_y = start_pos_yx[:, :, :, :, :1] # [N, out_H, out_W, kH*kW, 1] 仅仅是卷积核中心点在pad_x中的位置
start_pos_x = start_pos_yx[:, :, :, :, 1:] # [N, out_H, out_W, kH*kW, 1] 仅仅是卷积核中心点在pad_x中的位置
start_pos_y.stop_gradient = True
start_pos_x.stop_gradient = True
# 卷积核内部的偏移
half_W = (kW - 1) // 2
half_H = (kH - 1) // 2
y_inner, x_inner = paddle.meshgrid([paddle.arange(kH), paddle.arange(kW)])
y_inner -= half_H
x_inner -= half_W
filter_inner_offset_yx = paddle.stack((y_inner, x_inner), 2).cast(dtype='float32') # [kH, kW, 2] 卷积核内部的偏移
filter_inner_offset_yx = paddle.reshape(filter_inner_offset_yx, (1, 1, 1, kH * kW, 2)) # [1, 1, 1, kH*kW, 2] 卷积核内部的偏移
filter_inner_offset_yx = paddle.tile(filter_inner_offset_yx, [N, out_H, out_W, 1, 1]) # [N, out_H, out_W, kH*kW, 2] 卷积核内部的偏移
filter_inner_offset_y = filter_inner_offset_yx[:, :, :, :, :1] # [N, out_H, out_W, kH*kW, 1] 卷积核内部的偏移
filter_inner_offset_x = filter_inner_offset_yx[:, :, :, :, 1:] # [N, out_H, out_W, kH*kW, 1] 卷积核内部的偏移
filter_inner_offset_y.stop_gradient = True
filter_inner_offset_x.stop_gradient = True
# 预测的偏移
offset = paddle.transpose(offset, [0, 2, 3, 1]) # [N, out_H, out_W, kH*kW*2]
offset_yx = paddle.reshape(offset, (N, out_H, out_W, kH * kW, 2)) # [N, out_H, out_W, kH*kW, 2]
offset_y = offset_yx[:, :, :, :, :1] # [N, out_H, out_W, kH*kW, 1]
offset_x = offset_yx[:, :, :, :, 1:] # [N, out_H, out_W, kH*kW, 1]
# 最终采样位置。
pos_y = start_pos_y + filter_inner_offset_y + offset_y # [N, out_H, out_W, kH*kW, 1]
pos_x = start_pos_x + filter_inner_offset_x + offset_x # [N, out_H, out_W, kH*kW, 1]
pos_y = paddle.clip(pos_y, 0.0, H + padding * 2 - 1.0) # 最终采样位置限制在pad_x内
pos_x = paddle.clip(pos_x, 0.0, W + padding * 2 - 1.0) # 最终采样位置限制在pad_x内
# ================== 3.采样。用F.grid_sample()双线性插值采样。 ==================
pos_x = pos_x / (pad_x_W - 1) * 2.0 - 1.0
pos_y = pos_y / (pad_x_H - 1) * 2.0 - 1.0
xtyt = paddle.concat([pos_x, pos_y], -1) # [N, out_H, out_W, kH*kW, 2]
xtyt = paddle.reshape(xtyt, (N, out_H, out_W * kH * kW, 2)) # [N, out_H, out_W*kH*kW, 2]
value = F.grid_sample(pad_x, xtyt, mode='bilinear', padding_mode='zeros', align_corners=True) # [N, in_C, out_H, out_W*kH*kW]
value = paddle.reshape(value, (N, in_C, out_H, out_W, kH * kW)) # [N, in_C, out_H, out_W, kH * kW]
value = value.transpose((0, 1, 4, 2, 3)) # [N, in_C, kH * kW, out_H, out_W]
# ================== 4.乘以重要程度 ==================
# 乘以重要程度
mask = paddle.unsqueeze(mask, [1]) # [N, 1, kH * kW, out_H, out_W]
value = value * mask # [N, in_C, kH * kW, out_H, out_W]
new_x = paddle.reshape(value, (N, in_C * kH * kW, out_H, out_W)) # [N, in_C * kH * kW, out_H, out_W]
# ================== 5.乘以本层的权重，加上偏置 ==================
# 1x1卷积
rw = paddle.reshape(self.weight, (out_C, w_in * kH * kW, 1, 1)) # [out_C, w_in, kH, kW] -> [out_C, w_in*kH*kW, 1, 1] 变成1x1卷积核
out = F.conv2d(new_x, rw, bias=self.bias, stride=1, groups=groups) # [N, out_C, out_H, out_W]
return out
