# Copyright (c) 2020 PaddlePaddle Authors. All Rights Reserved. # # Licensed under the Apache License, Version 2.0 (the "License"); # you may not use this file except in compliance with the License. # You may obtain a copy of the License at # # http://www.apache.org/licenses/LICENSE-2.0 # # Unless required by applicable law or agreed to in writing, software # distributed under the License is distributed on an "AS IS" BASIS, # WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied. # See the License for the specific language governing permissions and # limitations under the License. import warnings import paddle from paddle.fluid.layer_helper import LayerHelper from paddle.fluid.layers.tensor import fill_constant from ...tensor import concat from ...tensor.creation import zeros from paddle.static import Variable from ...fluid import dygraph_utils # TODO: define the common functions to build a neural network from ...tensor.manipulation import squeeze from ...tensor.manipulation import unsqueeze from ...tensor import clip from ...tensor import sum from ...tensor import sqrt from ...fluid.data_feeder import check_variable_and_dtype, check_dtype, check_type from ...fluid.framework import _varbase_creator, _in_legacy_dygraph, in_dygraph_mode, _non_static_mode from ...fluid import dygraph_utils from paddle import _C_ops, _legacy_C_ops from paddle.framework import in_dynamic_mode from paddle.tensor.creation import full from paddle.framework import core from paddle.fluid.framework import _in_legacy_dygraph from paddle.static import default_main_program __all__ = [] def unfold(x, kernel_sizes, strides=1, paddings=0, dilations=1, name=None): r""" Return a col buffer of sliding local blocks of input x, also known as im2col for batched 2D image tensors. For each block under the convolution filter, all element will be rearranged as a column. While the convolution filter sliding over the input feature map, a series of such columns will be formed. For each input :math:`x` with shape [N, C, H, W], the output shape [N, Cout, Lout] can be calculated as following. .. math:: dkernel[0] &= dilations[0] \times (kernel\_sizes[0] - 1) + 1 dkernel[1] &= dilations[1] \times (kernel\_sizes[1] - 1) + 1 hout &= \frac{H + paddings[0] + paddings[2] - dkernel[0]}{strides[0]} + 1 wout &= \frac{W + paddings[1] + paddings[3] - dkernel[1]}{strides[1]} + 1 Cout &= C \times kernel\_sizes[0] \times kernel\_sizes[1] Lout &= hout \times wout Parameters: x(Tensor): 4-D Tensor, input tensor of format [N, C, H, W], data type can be float32 or float64 kernel_sizes(int|list): The size of convolution kernel, should be [k_h, k_w] or an integer k treated as [k, k]. strides(int|list): The strides, should be [stride_h, stride_w] or an integer stride treated as [sride, stride]. For default, strides will be [1, 1]. paddings(int|list): The paddings of each dimension, should be [padding_top, padding_left, padding_bottom, padding_right] or [padding_h, padding_w] or an integer padding. If [padding_h, padding_w] was given, it will expanded to [padding_h, padding_w, padding_h, padding_w]. If an integer padding was given, [padding, padding, padding, padding] will be used. For default, paddings will be [0, 0, 0, 0] dilations(int|list): the dilations of convolution kernel, should be [dilation_h, dilation_w], or an integer dilation treated as [dilation, dilation]. For default, it will be [1, 1]. name(str, optional): The default value is None. Normally there is no need for user to set this property. For more information, please refer to :ref:`api_guide_Name` Returns: Tensor, The tensor corresponding to the sliding local blocks. The output shape is [N, Cout, Lout] as decriabled above. Cout is the total number of values within each block, and Lout is the total number of such blocks. The data type of output is the same as the input :math:`x` Examples: .. code-block:: python import paddle import paddle.nn.functional as F x = paddle.randn((100,3,224,224)) y = F.unfold(x, [3, 3], 1, 1, 1) """ helper = LayerHelper("unfold", **locals()) check_variable_and_dtype(x, 'x', ['float32', 'float64'], 'unfold') assert len(x.shape) == 4, \ "input should be the format of [N, C, H, W]" if isinstance(kernel_sizes, int): kernel_sizes = [kernel_sizes, kernel_sizes] else: assert isinstance(kernel_sizes, list) and (len(kernel_sizes) == 2), \ "kernel_sizes should either be an integer or a list of two integers" if isinstance(strides, int): strides = [strides, strides] else: assert isinstance(strides, list) and (len(strides) == 2), \ "strides should either be an integer or a list of two integers" if isinstance(dilations, int): dilations = [dilations, dilations] else: assert isinstance(dilations, list) and (len(dilations) == 2), \ "dilations should either be an integer or a list of two integers" if isinstance(paddings, int): paddings = [paddings] * 4 elif isinstance(paddings, list): if len(paddings) == 2: paddings = paddings * 2 elif len(paddings) == 4: pass else: raise ValueError( "paddings should either be an integer or a list of 2 or 4 integers" ) else: raise ValueError( "Unexpected type of paddings, it should be either an integer or a list" "of 2 or 4 integers") if in_dygraph_mode(): return _C_ops.unfold(x, kernel_sizes, strides, paddings, dilations) out = helper.create_variable_for_type_inference(dtype=x.dtype) helper.append_op(type="unfold", inputs={"X": x}, outputs={"Y": out}, attrs={ "kernel_sizes": kernel_sizes, "strides": strides, "paddings": paddings, "dilations": dilations }) return out def interpolate(x, size=None, scale_factor=None, mode='nearest', align_corners=False, align_mode=0, data_format='NCHW', name=None): """ This API resizes a batch of images. The input must be a 3-D Tensor of the shape (num_batches, channels, in_w) or 4-D (num_batches, channels, in_h, in_w), or a 5-D Tensor of the shape (num_batches, channels, in_d, in_h, in_w) or (num_batches, in_d, in_h, in_w, channels), Where in_w is width of the input tensor, in_h is the height of the input tensor, in_d is the depth of the intput tensor. and the resizing only applies on the three dimensions(depth, height and width). Supporting resample methods: - 'linear' : Linear interpolation - 'bilinear' : Bilinear interpolation - 'trilinear' : Trilinear interpolation - 'nearest' : Nearest neighbor interpolation - 'bicubic' : Bicubic interpolation - 'area': Area interpolation Linear interpolation is the method of using a line connecting two known quantities to determine the value of an unknown quantity between the two known quantities. Nearest neighbor interpolation is to perform nearest neighbor interpolation in both the 3rd dimension(in height direction) and the 4th dimension(in width direction) on input tensor. Bilinear interpolation is an extension of linear interpolation for interpolating functions of two variables (e.g. H-direction and W-direction in this op) on a rectilinear 2D grid. The key idea is to perform linear interpolation first in one direction, and then again in the other direction. Trilinear interpolation is an extension of linear interpolation for interpolating functions of three variables (e.g. D-direction, H-direction and W-direction in this op) on a rectilinear 3D grid. The linear interpolation is performed on three directions. align_corners and align_mode are optional parameters,the calculation method of interpolation can be selected by them. Bicubic interpolation is an extension of cubic interpolation for interpolating data points on a two-dimensional regular grid. The interpolated surface is smoother than corresponding surfaces obtained by bilinear interpolation or nearest-neighbor interpolation. Area interpolation is to perform area interpolation in both the 3rd dimension(in height direction) , the 4th dimension(in width direction) and the 5th dimension(in depth direction) on input tensor. Set to area will directly call `paddle.nn.functional.adaptive_avg_pool1d` or `paddle.nn.functional.adaptive_avg_pool2d` or `paddle.nn.functional.adaptive_avg_pool3d`. Example: .. code-block:: text # For scale_factor: if align_corners = True && out_size > 1 : scale_factor = (in_size-1.0)/(out_size-1.0) else: scale_factor = float(in_size/out_size) # Linear interpolation: if: align_corners = False , align_mode = 0 input : (N,C,W_in) output: (N,C,W_out) where: W_out = (W_{in}+0.5) * scale_{factor} - 0.5 else: input : (N,C,W_in) output: (N,C,W_out) where: W_out = W_{in} * scale_{factor} # Nearest neighbor interpolation: align_corners = False input : (N,C,H_in,W_in) output: (N,C,H_out,W_out) where: H_out = floor (H_{in} * scale_{factor}) W_out = floor (W_{in} * scale_{factor}) # Bilinear interpolation: if: align_corners = False , align_mode = 0 input : (N,C,H_in,W_in) output: (N,C,H_out,W_out) where: H_out = (H_{in}+0.5) * scale_{factor} - 0.5 W_out = (W_{in}+0.5) * scale_{factor} - 0.5 else: input : (N,C,H_in,W_in) output: (N,C,H_out,W_out) where: H_out = H_{in} * scale_{factor} W_out = W_{in} * scale_{factor} # Bicubic interpolation: if: align_corners = False input : (N,C,H_in,W_in) output: (N,C,H_out,W_out) where: H_out = (H_{in}+0.5) * scale_{factor} - 0.5 W_out = (W_{in}+0.5) * scale_{factor} - 0.5 else: input : (N,C,H_in,W_in) output: (N,C,H_out,W_out) where: H_out = H_{in} * scale_{factor} W_out = W_{in} * scale_{factor} # Trilinear interpolation: if: align_corners = False , align_mode = 0 input : (N,C,D_in,H_in,W_in) output: (N,C,D_out,H_out,W_out) where: D_out = (D_{in}+0.5) * scale_{factor} - 0.5 H_out = (H_{in}+0.5) * scale_{factor} - 0.5 W_out = (W_{in}+0.5) * scale_{factor} - 0.5 else: input : (N,C,D_in,H_in,W_in) output: (N,C,D_out,H_out,W_out) where: D_out = D_{in} * scale_{factor} H_out = H_{in} * scale_{factor} W_out = W_{in} * scale_{factor} For details of linear interpolation, please refer to Wikipedia: https://en.wikipedia.org/wiki/Linear_interpolation. For details of nearest neighbor interpolation, please refer to Wikipedia: https://en.wikipedia.org/wiki/Nearest-neighbor_interpolation. For details of bilinear interpolation, please refer to Wikipedia: https://en.wikipedia.org/wiki/Bilinear_interpolation. For details of trilinear interpolation, please refer to Wikipedia: https://en.wikipedia.org/wiki/Trilinear_interpolation. For details of bicubic interpolation, please refer to Wikipedia: https://en.wikipedia.org/wiki/Bicubic_interpolation Parameters: x (Tensor): 3-D, 4-D or 5-D Tensor, its data type is float32, float64, or uint8, its data format is specified by :attr:`data_format`. size (list|tuple|Tensor|None): Output shape of image resize layer, the shape is (out_w, ) when input is a 3-D Tensor, the shape is (out_h, out_w) when input is a 4-D Tensor and is (out_d, out_h, out_w) when input is a 5-D Tensor. Default: None. If a list/tuple, each element can be an integer or a Tensor of shape: [1]. If a Tensor, its dimensions size should be a 1. scale_factor (float|Tensor|list|tuple|None): The multiplier for the input height or width. At least one of :attr:`size` or :attr:`scale_factor` must be set. And :attr:`size` has a higher priority than :attr:`scale_factor`.Has to match input size if it is either a list or a tuple or a Tensor. Default: None. mode (str): The resample method. It supports 'linear', 'area', 'nearest', 'bilinear', 'bicubic' and 'trilinear' currently. Default: 'nearest' align_corners(bool) : An optional bool, If True, the centers of the 4 corner pixels of the input and output tensors are aligned, preserving the values at the corner pixels.This only has an effect when 'linear', 'bilinear', 'bicubic' or 'trilinear'. Default: False align_mode(int) : An optional for linear/bilinear/trilinear interpolation. Refer to the formula in the example above, it can be \'0\' for src_idx = scale_factor*(dst_indx+0.5)-0.5 , can be \'1\' for src_idx = scale_factor*dst_index. data_format (str, optional): Specify the data format of the input, and the data format of the output will be consistent with that of the input. An optional string from:`NCW`, `NWC`, `"NCHW"`, `"NHWC"`, `"NCDHW"`, `"NDHWC"`. The default is `"NCHW"`. When it is `"NCHW"`, the data is stored in the order of: `[batch_size, input_channels, input_height, input_width]`. When it is `"NCHW"`, the data is stored in the order of: `[batch_size, input_channels, input_depth, input_height, input_width]`. name(str, optional): The default value is None. Normally there is no need for user to set this property. For more information, please refer to :ref:`api_guide_Name` Returns: A 3-D Tensor of the shape (num_batches, channels, out_w) or (num_batches, out_w, channels), A 4-D Tensor of the shape (num_batches, channels, out_h, out_w) or (num_batches, out_h, out_w, channels), or 5-D Tensor of the shape (num_batches, channels, out_d, out_h, out_w) or (num_batches, out_d, out_h, out_w, channels). Examples: .. code-block:: python import paddle import paddle.nn.functional as F input_data = paddle.randn(shape=(2,3,6,10)).astype(paddle.float32) output_1 = F.interpolate(x=input_data, size=[12,12]) print(output_1.shape) # [2L, 3L, 12L, 12L] # given scale output_2 = F.interpolate(x=input_data, scale_factor=[2,1]) print(output_2.shape) # [2L, 3L, 12L, 10L] # bilinear interp output_3 = F.interpolate(x=input_data, scale_factor=[2,1], mode="bilinear") print(output_2.shape) # [2L, 3L, 12L, 10L] """ data_format = data_format.upper() resample = mode.upper() resample_type = mode.lower() resample_methods = [ 'LINEAR', 'BILINEAR', 'TRILINEAR', 'NEAREST', 'BICUBIC', 'AREA', ] if resample not in resample_methods: raise ValueError( "The 'resample' of image_resize can only be 'area', 'linear', 'bilinear', 'trilinear', " " 'bicubic' or 'nearest' currently.") if resample in ['LINEAR'] and len(x.shape) != 3: raise ValueError("'linear' only support 3-D tensor.") if resample in ['NEAREST'] and len(x.shape) != 4 and len(x.shape) != 5: raise ValueError("'NEAREST' only support 4-D or 5-D tensor.") if resample in ['BILINEAR', 'BICUBIC'] and len(x.shape) != 4: raise ValueError("'bilinear' and 'bicubic' only support 4-D tensor.") if resample == 'TRILINEAR' and len(x.shape) != 5: raise ValueError("'trilinear'only support 5-D tensor.") if size is None and scale_factor is None: raise ValueError("One of size and scale_factor must not be None.") if not isinstance(align_corners, bool): raise TypeError("Attr align_corners should be a bool value") if align_mode != 0 and align_mode != 1: raise ValueError("align_mode can only be 0 or 1") if align_corners != 0 and resample == 'NEAREST': raise ValueError( "align_corners option can only be set with the interpolating modes: linear | bilinear | bicubic | trilinear" ) if resample == 'AREA': if isinstance(size, list) or isinstance(size, tuple) or isinstance( size, Variable): if len(size) == 0: raise ValueError("output size can not be empty") if len(x.shape) == 3: return paddle.nn.functional.adaptive_avg_pool1d(x, size) elif len(x.shape) == 4: return paddle.nn.functional.adaptive_avg_pool2d(x, size) elif len(x.shape) == 5: return paddle.nn.functional.adaptive_avg_pool3d(x, size) helper = LayerHelper('{}_interp_v2'.format(resample_type), **locals()) dtype = helper.input_dtype(input_param_name='x') if len(x.shape) == 3 and data_format not in ['NCW', 'NWC']: raise ValueError( "Got wrong value for param `data_format`: " + data_format + " received but only `NCW` or `NWC` supported for 3-D input.") elif len(x.shape) == 4 and data_format not in ['NCHW', 'NHWC']: raise ValueError( "Got wrong value for param `data_format`: " + data_format + " received but only `NCHW` or `NHWC` supported for 4-D input.") elif len(x.shape) == 5 and data_format not in ['NCDHW', 'NDHWC']: raise ValueError( "Got wrong value for param `data_format`: " + data_format + " received but only `NCDHW` or `NDHWC` supported for 5-D input.") def _is_list_or_turple_(data): return (isinstance(data, list) or isinstance(data, tuple)) if data_format == 'NCHW' or data_format == 'NCDHW' or data_format == 'NCW': data_layout = 'NCHW' if data_format == 'NHWC' or data_format == 'NDHWC' or data_format == 'NWC': data_layout = 'NHWC' if resample == 'NEAREST': align_corners = False inputs = {"X": x} attrs = { "out_d": -1, "out_h": -1, "out_w": -1, "interp_method": resample_type, "align_corners": align_corners, "align_mode": align_mode, "data_layout": data_layout } out_shape = size scale = scale_factor if out_shape is not None and scale is not None: raise ValueError("Only one of size or scale_factor should be defined.") if out_shape is not None: if isinstance(out_shape, Variable) and not in_dynamic_mode(): out_shape.stop_gradient = True inputs['OutSize'] = out_shape else: if in_dynamic_mode(): if isinstance(out_shape, Variable): out_shape = list(out_shape.numpy()) else: out_shape = list(out_shape) for i, dim in enumerate(out_shape): if isinstance(dim, Variable): out_shape[i] = dim.numpy()[0] if not (_is_list_or_turple_(out_shape)): raise TypeError("size should be a list or tuple or Variable.") # Validate the shape contain_var = False for dim_idx, dim_size in enumerate(out_shape): if isinstance(dim_size, Variable): contain_var = True continue assert dim_size > 0, ( "Each dimension size given in out_shape must be greater than 0." ) if contain_var: new_size_tensor = [] size_list = [] for dim in out_shape: if isinstance(dim, Variable): dim.stop_gradient = True new_size_tensor.append(dim) size_list.append(-1) else: assert (isinstance(dim, int)) temp_out = helper.create_variable_for_type_inference( 'int32') fill_constant([1], 'int32', dim, force_cpu=True, out=temp_out) new_size_tensor.append(temp_out) size_list.append(dim) inputs['SizeTensor'] = new_size_tensor if len(x.shape) == 3: if len(out_shape) != 1: raise ValueError( "size length should be 2 for input 3-D tensor") if contain_var: attrs['out_w'] = size_list[0] else: out_shape = list(map(int, out_shape)) attrs['out_w'] = out_shape[0] if len(x.shape) == 4: if len(out_shape) != 2: raise ValueError("size length should be 2 for " "input 4-D tensor.") if contain_var: attrs['out_h'] = size_list[0] attrs['out_w'] = size_list[1] else: out_shape = list(map(int, out_shape)) attrs['out_h'] = out_shape[0] attrs['out_w'] = out_shape[1] if len(x.shape) == 5: if len(out_shape) != 3: raise ValueError("size length should be 3 for " "input 5-D tensor.") if contain_var: attrs['out_d'] = size_list[0] attrs['out_h'] = size_list[1] attrs['out_w'] = size_list[2] else: out_shape = list(map(int, out_shape)) attrs['out_d'] = out_shape[0] attrs['out_h'] = out_shape[1] attrs['out_w'] = out_shape[2] else: if in_dynamic_mode() and isinstance(scale, Variable): scale = list(scale.numpy()) if isinstance(scale, Variable): scale.stop_gradient = True inputs["Scale"] = scale elif isinstance(scale, float) or isinstance(scale, int): if scale <= 0: raise ValueError("Attr(scale) should be greater than zero.") scale_list = [] for i in range(len(x.shape) - 2): scale_list.append(scale) attrs['scale'] = list(map(float, scale_list)) elif isinstance(scale, list) or isinstance(scale, tuple): if len(scale) != len(x.shape) - 2: raise ValueError("scale_shape length should be {} for " "input {}-D tensor.".format( len(x.shape) - 2, len(x.shape))) for value in scale: if value <= 0: raise ValueError("Attr(scale) should be greater than zero.") attrs['scale'] = list(map(float, scale)) else: raise TypeError( "Attr(scale)'s type should be float, int, list, tuple, or Tensor." ) if in_dynamic_mode(): attr_list = [] for k, v in attrs.items(): attr_list.append(k) attr_list.append(v) dy_attr = tuple(attr_list) if resample_type == "linear": if in_dygraph_mode(): out = _C_ops.linear_interp( x, inputs['OutSize'] if 'OutSize' in inputs else None, inputs['SizeTensor'] if 'SizeTensor' in inputs else None, inputs['Scale'] if 'Scale' in inputs else None, attrs['data_layout'], attrs['out_d'], attrs['out_h'], attrs['out_w'], attrs['scale'] if 'scale' in attrs else [], attrs['interp_method'], attrs['align_corners'], attrs['align_mode']) else: out = _legacy_C_ops.linear_interp_v2(x, *dy_attr) elif resample_type == "bilinear": if in_dygraph_mode(): out = _C_ops.bilinear_interp( x, inputs['OutSize'] if 'OutSize' in inputs else None, inputs['SizeTensor'] if 'SizeTensor' in inputs else None, inputs['Scale'] if 'Scale' in inputs else None, attrs['data_layout'], attrs['out_d'], attrs['out_h'], attrs['out_w'], attrs['scale'] if 'scale' in attrs else [], attrs['interp_method'], attrs['align_corners'], attrs['align_mode']) else: out = _legacy_C_ops.bilinear_interp_v2(x, *dy_attr) elif resample_type == "trilinear": if in_dygraph_mode(): out = _C_ops.trilinear_interp( x, inputs['OutSize'] if 'OutSize' in inputs else None, inputs['SizeTensor'] if 'SizeTensor' in inputs else None, inputs['Scale'] if 'Scale' in inputs else None, attrs['data_layout'], attrs['out_d'], attrs['out_h'], attrs['out_w'], attrs['scale'] if 'scale' in attrs else [], attrs['interp_method'], attrs['align_corners'], attrs['align_mode']) else: out = _legacy_C_ops.trilinear_interp_v2(x, *dy_attr) elif resample_type == "nearest": if in_dygraph_mode(): out = _C_ops.nearest_interp( x, inputs['OutSize'] if 'OutSize' in inputs else None, inputs['SizeTensor'] if 'SizeTensor' in inputs else None, inputs['Scale'] if 'Scale' in inputs else None, attrs['data_layout'], attrs['out_d'], attrs['out_h'], attrs['out_w'], attrs['scale'] if 'scale' in attrs else [], attrs['interp_method'], attrs['align_corners'], attrs['align_mode']) else: out = _legacy_C_ops.nearest_interp_v2(x, *dy_attr) elif resample_type == "bicubic": if in_dygraph_mode(): out = _C_ops.bicubic_interp( x, inputs['OutSize'] if 'OutSize' in inputs else None, inputs['SizeTensor'] if 'SizeTensor' in inputs else None, inputs['Scale'] if 'Scale' in inputs else None, attrs['data_layout'], attrs['out_d'], attrs['out_h'], attrs['out_w'], attrs['scale'] if 'scale' in attrs else [], attrs['interp_method'], attrs['align_corners'], attrs['align_mode']) else: out = _legacy_C_ops.bicubic_interp_v2(x, *dy_attr) return out out = helper.create_variable_for_type_inference(dtype) helper.append_op(type='{}_interp_v2'.format(resample_type), inputs=inputs, outputs={"Out": out}, attrs=attrs) return out def upsample(x, size=None, scale_factor=None, mode='nearest', align_corners=False, align_mode=0, data_format='NCHW', name=None): """ This API resizes a batch of images. The input must be a 3-D Tensor of the shape (num_batches, channels, in_w) or 4-D (num_batches, channels, in_h, in_w), or a 5-D Tensor of the shape (num_batches, channels, in_d, in_h, in_w) or (num_batches, in_d, in_h, in_w, channels), Where in_w is width of the input tensor, in_h is the height of the input tensor, in_d is the depth of the intput tensor. and the resizing only applies on the three dimensions(depth, height and width). Supporting resample methods: 'linear' : Linear interpolation 'bilinear' : Bilinear interpolation 'trilinear' : Trilinear interpolation 'nearest' : Nearest neighbor interpolation 'bicubic' : Bicubic interpolation Linear interpolation is the method of using a line connecting two known quantities to determine the value of an unknown quantity between the two known quantities. Nearest neighbor interpolation is to perform nearest neighbor interpolation in both the 3rd dimension(in height direction) and the 4th dimension(in width direction) on input tensor. Bilinear interpolation is an extension of linear interpolation for interpolating functions of two variables (e.g. H-direction and W-direction in this op) on a rectilinear 2D grid. The key idea is to perform linear interpolation first in one direction, and then again in the other direction. Bicubic interpolation is an extension of cubic interpolation for interpolating data points on a two-dimensional regular grid. The interpolated surface is smoother than corresponding surfaces obtained by bilinear interpolation or nearest-neighbor interpolation. Trilinear interpolation is an extension of linear interpolation for interpolating functions of three variables (e.g. D-direction, H-direction and W-direction in this op) on a rectilinear 3D grid. The linear interpolation is performed on three directions. align_corners and align_mode are optional parameters,the calculation method of interpolation can be selected by them. Area interpolation is to perform area interpolation in both the 3rd dimension(in height direction) , the 4th dimension(in width direction) and the 5th dimension(in depth direction) on input tensor. Set to area will directly call `paddle.nn.functional.adaptive_avg_pool1d` or `paddle.nn.functional.adaptive_avg_pool2d` or `paddle.nn.functional.adaptive_avg_pool3d`. Example: .. code-block:: text For scale_factor: if align_corners = True && out_size > 1 : scale_factor = (in_size-1.0)/(out_size-1.0) else: scale_factor = float(in_size/out_size) Linear interpolation: if: align_corners = False , align_mode = 0 input : (N,C,W_in) output: (N,C,W_out) where: W_out = (W_{in}+0.5) * scale_{factor} - 0.5 else: input : (N,C,W_in) output: (N,C,W_out) where: W_out = W_{in} * scale_{factor} Nearest neighbor interpolation: if: align_corners = False input : (N,C,H_in,W_in) output: (N,C,H_out,W_out) where: H_out = floor (H_{in} * scale_{factor}) W_out = floor (W_{in} * scale_{factor}) else: align_corners = True input : (N,C,H_in,W_in) output: (N,C,H_out,W_out) where: H_out = round(H_{in} * scale_{factor}) W_out = round(W_{in} * scale_{factor}) Bilinear interpolation: if: align_corners = False , align_mode = 0 input : (N,C,H_in,W_in) output: (N,C,H_out,W_out) where: H_out = (H_{in}+0.5) * scale_{factor} - 0.5 W_out = (W_{in}+0.5) * scale_{factor} - 0.5 else: input : (N,C,H_in,W_in) output: (N,C,H_out,W_out) where: H_out = H_{in} * scale_{factor} W_out = W_{in} * scale_{factor} Bicubic interpolation: if: align_corners = False input : (N,C,H_in,W_in) output: (N,C,H_out,W_out) where: H_out = (H_{in}+0.5) * scale_{factor} - 0.5 W_out = (W_{in}+0.5) * scale_{factor} - 0.5 else: input : (N,C,H_in,W_in) output: (N,C,H_out,W_out) where: H_out = H_{in} * scale_{factor} W_out = W_{in} * scale_{factor} Trilinear interpolation: if: align_corners = False , align_mode = 0 input : (N,C,D_in,H_in,W_in) output: (N,C,D_out,H_out,W_out) where: D_out = (D_{in}+0.5) * scale_{factor} - 0.5 H_out = (H_{in}+0.5) * scale_{factor} - 0.5 W_out = (W_{in}+0.5) * scale_{factor} - 0.5 else: input : (N,C,D_in,H_in,W_in) output: (N,C,D_out,H_out,W_out) where: D_out = D_{in} * scale_{factor} H_out = H_{in} * scale_{factor} W_out = W_{in} * scale_{factor} https://en.wikipedia.org/wiki/Linear_interpolation. For details of linear interpolation, please refer to Wikipedia: For details of nearest neighbor interpolation, please refer to Wikipedia: https://en.wikipedia.org/wiki/Nearest-neighbor_interpolation. For details of bilinear interpolation, please refer to Wikipedia: https://en.wikipedia.org/wiki/Bilinear_interpolation. For details of bicubic interpolation, please refer to Wikipedia: https://en.wikipedia.org/wiki/Bicubic_interpolation For details of trilinear interpolation, please refer to Wikipedia: https://en.wikipedia.org/wiki/Trilinear_interpolation. Parameters: x (Tensor): 3-D, 4-D or 5-D Tensor, its data type is float32, float64, or uint8, its data format is specified by :attr:`data_format`. size (list|tuple|Tensor|None, optional): Output shape of image resize layer, the shape is (out_w, ) when input is a 3-D Tensor, the shape is (out_h, out_w) when input is a 4-D Tensor and is (out_d, out_h, out_w) when input is a 5-D Tensor. Default: None. If a list/tuple, each element can be an integer or a Tensor of shape: [1]. If a Tensor , its dimensions size should be a 1. scale_factor (float|Tensor|list|tuple|None, optional): The multiplier for the input height or width. At least one of :attr:`size` or :attr:`scale_factor` must be set. And :attr:`size` has a higher priority than :attr:`scale_factor`.Has to match input size if it is either a list or a tuple or a Tensor. Default: None. mode (str, optional): The resample method. It supports 'linear', 'nearest', 'bilinear', 'bicubic' and 'trilinear' currently. Default: 'nearest' align_corners(bool, optional) : An optional bool, If True, the centers of the 4 corner pixels of the input and output tensors are aligned, preserving the values at the corner pixels. Default: False align_mode(int, optional) : An optional for linear/bilinear/trilinear interpolation. Refer to the formula in the example above, it can be \'0\' for src_idx = scale_factor*(dst_indx+0.5)-0.5 , can be \'1\' for src_idx = scale_factor*dst_index. data_format (str, optional): Specify the data format of the input, and the data format of the output will be consistent with that of the input. An optional string from:`NCW`, `NWC`, `"NCHW"`, `"NHWC"`, `"NCDHW"`, `"NDHWC"`. The default is `"NCHW"`. When it is `"NCHW"`, the data is stored in the order of: `[batch_size, input_channels, input_height, input_width]`. When it is `"NCHW"`, the data is stored in the order of: `[batch_size, input_channels, input_depth, input_height, input_width]`. name(str, optional): The default value is None. Normally there is no need for user to set this property. For more information, please refer to :ref:`api_guide_Name` Returns: A 3-D Tensor of the shape (num_batches, channels, out_w) or (num_batches, out_w, channels), A 4-D Tensor of the shape (num_batches, channels, out_h, out_w) or (num_batches, out_h, out_w, channels), or 5-D Tensor of the shape (num_batches, channels, out_d, out_h, out_w) or (num_batches, out_d, out_h, out_w, channels). Examples: .. code-block:: python import paddle import paddle.nn as nn input_data = paddle.randn(shape=(2,3,6,10)).astype(paddle.float32) upsample_out = paddle.nn.Upsample(size=[12,12]) output = upsample_out(x=input_data) print(output.shape) # [2L, 3L, 12L, 12L] """ return interpolate(x, size, scale_factor, mode, align_corners, align_mode, data_format) def bilinear(x1, x2, weight, bias=None, name=None): """ This layer performs bilinear on two inputs. See :ref:`api_nn_Bilinear` for details and output shape. Parameters: x1 (Tensor): the first input tensor, it's data type should be float32, float64. x2 (Tensor): the second input tensor, it's data type should be float32, float64. weight (Parameter): The learnable weights of this layer, shape is [out_features, in1_features, in2_features]. bias (Parameter, optional): The learnable bias(Bias) of this layer, shape is [1, out_features]. If it is set to None, no bias will be added to the output units. The default value is None. name (str, optional): The default value is None. Normally there is no need for user to set this property. For more information, please refer to :ref:`api_guide_Name`. Default: None. Returns: Tensor: A 2-D Tensor of shape [batch_size, out_features]. Examples: .. code-block:: python import paddle import paddle.nn.functional as F x1 = paddle.randn((5, 5)).astype(paddle.float32) x2 = paddle.randn((5, 4)).astype(paddle.float32) w = paddle.randn((1000, 5, 4)).astype(paddle.float32) b = paddle.randn((1, 1000)).astype(paddle.float32) result = F.bilinear(x1, x2, w, b) print(result.shape) # [5, 1000] """ if in_dygraph_mode(): return _C_ops.bilinear_tensor_product(x1, x2, weight, bias) elif _non_static_mode(): return _legacy_C_ops.bilinear_tensor_product(x1, x2, weight, bias) check_variable_and_dtype(x1, 'x1', ['float32', 'float64'], 'bilinear') check_variable_and_dtype(x2, 'x2', ['float32', 'float64'], 'bilinear') inputs = {"X": x1, "Y": x2, "Weight": weight} if bias is not None: inputs["Bias"] = bias helper = LayerHelper("bilinear", **locals()) out = helper.create_variable_for_type_inference(dtype=x1.dtype) helper.append_op(type="bilinear_tensor_product", inputs=inputs, outputs={"Out": out}) return out def dropout(x, p=0.5, axis=None, training=True, mode="upscale_in_train", name=None): """ Dropout is a regularization technique for reducing overfitting by preventing neuron co-adaption during training. The dropout operator randomly sets the outputs of some units to zero, while upscale others according to the given dropout probability. Args: x (Tensor): The input tensor. The data type is float32 or float64. p (float|int, optional): Probability of setting units to zero. Default 0.5. axis (int|list|tuple, optional): The axis along which the dropout is performed. Default None. training (bool, optional): A flag indicating whether it is in train phrase or not. Default True. mode(str, optional): ['upscale_in_train'(default) | 'downscale_in_infer']. 1. upscale_in_train(default), upscale the output at training time - train: out = input * mask / ( 1.0 - dropout_prob ) - inference: out = input 2. downscale_in_infer, downscale the output at inference - train: out = input * mask - inference: out = input * (1.0 - dropout_prob) name (str, optional): Name for the operation (optional, default is None). For more information, please refer to :ref:`api_guide_Name`. Returns: A Tensor representing the dropout, has same shape and data type as `x` . Examples: We use ``p=0.5`` in the following description for simplicity. 1. When ``axis=None`` , this is commonly used dropout, which dropout each element of x randomly. .. code-block:: text Let's see a simple case when x is a 2d tensor with shape 2*3: [[1 2 3] [4 5 6]] we generate mask with the same shape as x, which is 2*3. The value of mask is sampled from a Bernoulli distribution randomly. For example, we may get such mask: [[0 1 0] [1 0 1]] So the output is obtained from elementwise multiply of x and mask: [[0 2 0] [4 0 6]] Using default setting, i.e. ``mode='upscale_in_train'`` , if in training phase, the final upscale output is: [[0 4 0 ] [8 0 12]] if in test phase, the output is the same as input: [[1 2 3] [4 5 6]] we can also set ``mode='downscale_in_infer'`` , then if in training phase, the final output is: [[0 2 0] [4 0 6]] if in test phase, the scale output is: [[0.5 1. 1.5] [2. 2.5 3. ]] 2. When ``axis!=None`` , this is useful for dropping whole channels from an image or sequence. .. code-block:: text Let's see the simple case when x is a 2d tensor with shape 2*3 again: [[1 2 3] [4 5 6]] (1) If ``axis=0`` , this means the dropout is only performed in axis `0` . we generate mask with the shape 2*1. Only in axis `0` the value is randomly selected. For example, we may get such mask: [[1] [0]] The output is obtained from elementwise multiply of x and mask. Doing that the mask will be broadcast from 2*1 to 2*3: [[1 1 1] [0 0 0]] and the result after elementwise multiply is: [[1 2 3] [0 0 0]] then we can do upscale or downscale according to the setting of other arguments. (2) If ``axis=1`` , this means the dropout is only performed in axis `1` . we generate mask with the shape 1*3. Only in axis `1` the value is randomly selected. For example, we may get such mask: [[1 0 1]] Doing elementwise multiply the mask will be broadcast from 1*3 to 2*3: [[1 0 1] [1 0 1]] and the result after elementwise multiply is: [[1 0 3] [4 0 6]] (3) What about ``axis=[0, 1]`` ? This means the dropout is performed in all axes of x, which is the same case as default setting ``axis=None`` . (4) You may note that logically `axis=None` means the dropout is performed in none axis of x, We generate mask with the shape 1*1. Whole input is randomly selected or dropped. For example, we may get such mask: [[0]] Doing elementwise multiply the mask will be broadcast from 1*1 to 2*3: [[0 0 0] [0 0 0]] and the result after elementwise multiply is: [[0 0 0] [0 0 0]] Actually this is not what we want because all elements may set to zero~ When x is a 4d tensor with shape `NCHW`, we can set ``axis=[0,1]`` and the dropout will be performed in channel `N` and `C`, `H` and `W` is tied, i.e. paddle.nn.dropout(x, p, axis=[0,1]) . Please refer to ``paddle.nn.functional.dropout2d`` for more details. Similarly, when x is a 5d tensor with shape `NCDHW`, we can set ``axis=[0,1]`` to perform dropout3d. Please refer to ``paddle.nn.functional.dropout3d`` for more details. .. code-block:: python import paddle x = paddle.to_tensor([[1,2,3], [4,5,6]]).astype(paddle.float32) y_train = paddle.nn.functional.dropout(x, 0.5) y_test = paddle.nn.functional.dropout(x, 0.5, training=False) y_0 = paddle.nn.functional.dropout(x, axis=0) y_1 = paddle.nn.functional.dropout(x, axis=1) y_01 = paddle.nn.functional.dropout(x, axis=[0,1]) print(x) # Tensor(shape=[2, 3], dtype=float32, place=Place(cpu), stop_gradient=True, # [[1., 2., 3.], # [4., 5., 6.]]) print(y_train) # Tensor(shape=[2, 3], dtype=float32, place=Place(cpu), stop_gradient=True, # [[2. , 0. , 6. ], # [8. , 0. , 12.]]) print(y_test) # Tensor(shape=[2, 3], dtype=float32, place=Place(cpu), stop_gradient=True, # [[1., 2., 3.], # [4., 5., 6.]]) print(y_0) # Tensor(shape=[2, 3], dtype=float32, place=Place(cpu), stop_gradient=True, # [[0. , 0. , 0. ], # [8. , 10., 12.]]) print(y_1) # Tensor(shape=[2, 3], dtype=float32, place=Place(cpu), stop_gradient=True, # [[2. , 0. , 6. ], # [8. , 0. , 12.]]) print(y_01) # Tensor(shape=[2, 3], dtype=float32, place=Place(cpu), stop_gradient=True, # [[0. , 0. , 0. ], # [8. , 0. , 12.]]) """ if not isinstance(p, (float, int, Variable)): raise TypeError("p argument should be a number or Variable") if isinstance(p, (int, float)): # fast return for p == 0 if p == 0: return x elif p < 0 or p > 1: raise ValueError("p argument should between 0 and 1") if mode not in ('downscale_in_infer', 'upscale_in_train'): raise ValueError( "mode argument should be 'downscale_in_infer' or 'upscale_in_train'" ) if axis and not isinstance(axis, (int, list, tuple)): raise TypeError("datatype of axis argument should be int or list") if axis == None: # commonly used dropout seed = None mode = 'downgrade_in_infer' if mode == 'downscale_in_infer' else mode #semantic transfer if _non_static_mode(): if default_main_program().random_seed != 0: seed = default_main_program().random_seed if in_dygraph_mode(): out, mask = _C_ops.dropout( x, None, p, not training, mode, \ seed if seed is not None else 0, seed is not None) return out out, mask = _legacy_C_ops.dropout(x, 'dropout_prob', p, 'is_test', not training, 'fix_seed', seed is not None, 'seed', seed if seed is not None else 0, 'dropout_implementation', mode) return out helper = LayerHelper('dropout', **locals()) check_variable_and_dtype(x, 'x', ['float16', 'float32', 'float64'], 'dropout') out = helper.create_variable_for_type_inference(dtype=x.dtype) mask = helper.create_variable_for_type_inference( dtype=core.VarDesc.VarType.UINT8, stop_gradient=True) def get_attrs(prog, dropout_prob, is_test, seed): if (seed is None or seed == 0) and prog.random_seed != 0: seed = prog.random_seed if isinstance(dropout_prob, Variable) and not dropout_prob.shape != [1]: raise TypeError( "Required p.shape == [1] if type(p) is Variable, but received p.shape = {}" .format(p.shape)) attrs = { 'dropout_prob': dropout_prob, 'is_test': is_test, 'fix_seed': seed is not None, 'seed': seed if seed is not None else 0, 'dropout_implementation': mode, } return attrs attrs = get_attrs(helper.main_program, p, not training, seed) helper.append_op(type='dropout', inputs={'X': [x]}, outputs={ 'Out': [out], 'Mask': [mask] }, attrs=attrs) return out else: #sometimes called dropout_nd #TODO: optimize with c++ if not in_dynamic_mode(): check_variable_and_dtype(x, 'x', ['float32', 'float64'], 'dropout') dtype = x.dtype keep_prob = 1 - p if training: if p == 1.: return paddle.scale(x, scale=0.) scale_input = paddle.scale( x, scale=1 / keep_prob) if mode == 'upscale_in_train' else x #get mask shape input_shape = x.shape if not in_dynamic_mode(): input_shape_tensor = paddle.shape(x) drop_axes = [axis] if isinstance(axis, int) else list(axis) if min(drop_axes) < 0 or max(drop_axes) > len(input_shape) - 1: raise ValueError("axis value should be greater than or equal to 0 and less than dimensions of x:{}, but get axis value:{} " \ .format(len(input_shape), max(drop_axes))) if len(drop_axes) > len(input_shape): raise ValueError( "length of axis should not be greater than dimensions of x:{}, but get length of axis: {}" .format(len(input_shape), len(drop_axes))) mask_shape = [1] * len(input_shape) if not in_dynamic_mode(): for i in drop_axes: mask_shape[i] = input_shape_tensor[i] else: for i in drop_axes: mask_shape[i] = input_shape[i] #get mask random_tensor = paddle.uniform(mask_shape, dtype='float32', min=0., max=1.0) p = full(shape=[1], fill_value=p, dtype='float32') keep_mask = paddle.greater_equal(random_tensor, p) scale_input = paddle.cast(scale_input, dtype) keep_mask = paddle.cast(keep_mask, dtype) ret = paddle.multiply(scale_input, keep_mask, name=name) return ret else: # test ret = paddle.scale( x, scale=keep_prob) if mode == 'downscale_in_infer' else x return ret def dropout2d(x, p=0.5, training=True, data_format='NCHW', name=None): """ Randomly zero out entire channels (in the batched input 4d tensor with the shape `NCHW` , a channel is a 2D feature map with the shape `HW` ). Each channel will be zeroed out independently on every forward call with probability `p` using samples from a Bernoulli distribution. See ``paddle.nn.functional.dropout`` for more details. Args: x (Tensor): The input is 4-D Tensor with shape [N, C, H, W] or [N, H, W, C]. The data type is float32 or float64. p (float): Probability of setting units to zero. Default 0.5. training (bool): A flag indicating whether it is in train phrase or not. Default True. data_format (str, optional): Specify the data format of the input, and the data format of the output will be consistent with that of the input. An optional string from `NCHW` or `NHWC` . The default is `NCHW` . When it is `NCHW` , the data is stored in the order of: [batch_size, input_channels, input_height, input_width]. name (str, optional): Name for the operation (optional, default is None). For more information, please refer to :ref:`api_guide_Name`. Returns: A Tensor representing the dropout2d, has same shape and data type as `x` . Examples: .. code-block:: python import paddle x = paddle.randn(shape=(2, 3, 4, 5)).astype(paddle.float32) y_train = paddle.nn.functional.dropout2d(x) #train y_test = paddle.nn.functional.dropout2d(x, training=False) #test for i in range(2): for j in range(3): print(x[i,j,:,:]) print(y_train[i,j,:,:]) # may all 0 print(y_test[i,j,:,:]) """ input_shape = x.shape if len(input_shape) != 4: raise ValueError("dimensions of x should be 4, but received {} != 4"\ .format(len(input_shape))) if data_format not in ["NCHW", "NHWC"]: raise ValueError( "Attr(data_format) should be 'NCHW' or 'NHWC'. Received " "Attr(data_format): %s." % str(data_format)) return dropout(x, p=p, axis=[0, 1] if data_format == 'NCHW' else [0, 3], training=training, mode="upscale_in_train", name=name) def dropout3d(x, p=0.5, training=True, data_format='NCDHW', name=None): """ Randomly zero out entire channels (in the batched input 5d tensor with the shape `NCDHW` , a channel is a 3D feature map with the shape `DHW` ). Each channel will be zeroed out independently on every forward call with probability `p` using samples from a Bernoulli distribution. See ``paddle.nn.functional.dropout`` for more details. Args: x (Tensor): The input is 5-D Tensor with shape [N, C, D, H, W] or [N, D, H, W, C]. The data type is float32 or float64. p (float): Probability of setting units to zero. Default 0.5. training (bool): A flag indicating whether it is in train phrase or not. Default True. data_format (str, optional): Specify the data format of the input, and the data format of the output will be consistent with that of the input. An optional string from ``NCDHW`` or ``NDHWC``. The default is ``NCDHW`` . When it is ``NCDHW`` , the data is stored in the order of: [batch_size, input_channels, input_depth, input_height, input_width]. name (str, optional): Name for the operation (optional, default is None). For more information, please refer to :ref:`api_guide_Name`. Returns: A Tensor representing the dropout3d, has same shape and data type with `x` . Examples: .. code-block:: python import paddle x = paddle.randn(shape=(2, 3, 4, 5, 6)).astype(paddle.float32) y_train = paddle.nn.functional.dropout3d(x) #train y_test = paddle.nn.functional.dropout3d(x, training=False) #test print(x[0,0,:,:,:]) print(y_train[0,0,:,:,:]) # may all 0 print(y_test[0,0,:,:,:]) """ input_shape = x.shape if len(input_shape) != 5: raise ValueError("dimensions of x should be 5, but received {} != 5" \ .format(len(input_shape))) if data_format not in ["NCDHW", "NDHWC"]: raise ValueError( "Attr(data_format) should be 'NCDHW' or 'NDHWC'. Received " "Attr(data_format): %s." % str(data_format)) return dropout(x, p=p, axis=[0, 1] if data_format == 'NCDHW' else [0, 4], training=training, mode="upscale_in_train", name=name) def alpha_dropout(x, p=0.5, training=True, name=None): """ Alpha Dropout is a type of Dropout that maintains the self-normalizing property. For an input with zero mean and unit standard deviation, the output of Alpha Dropout maintains the original mean and standard deviation of the input. Alpha Dropout fits well to SELU activate function by randomly setting activations to the negative saturation value. Args: x (Tensor): The input tensor. The data type is float32 or float64. p (float | int): Probability of setting units to zero. Default 0.5. training (bool): A flag indicating whether it is in train phrase or not. Default True. name (str, optional): Name for the operation (optional, default is None). For more information, please refer to :ref:`api_guide_Name`. Returns: A Tensor representing the dropout, has same shape and data type as `x`. Examples: .. code-block:: python import paddle x = paddle.to_tensor([[-1, 1], [-1, 1]]).astype(paddle.float32) y_train = paddle.nn.functional.alpha_dropout(x, 0.5) y_test = paddle.nn.functional.alpha_dropout(x, 0.5, training=False) print(y_train) # Tensor(shape=[2, 2], dtype=float32, place=Place(cpu), stop_gradient=True, # [[-0.10721093, -0.77919382], # [-0.10721093, 1.66559887]]) (randomly) print(y_test) # Tensor(shape=[2, 2], dtype=float32, place=Place(cpu), stop_gradient=True, # [[-1., 1.], # [-1., 1.]]) """ if not isinstance(p, (float, int)): raise TypeError("p argument should be a float or int") if p < 0 or p > 1: raise ValueError("p argument should between 0 and 1") if not in_dynamic_mode(): check_variable_and_dtype(x, 'x', ['float32', 'float64'], 'alpha_dropout') if training: if p == 1: return paddle.scale(x, scale=0.) #get transformation params alpha = 1.6732632423543772848170429916717 scale = 1.0507009873554804934193349852946 alpha_p = -alpha * scale a = ((1 - p) * (1 + p * alpha_p**2))**-0.5 b = -a * alpha_p * p dtype = x.dtype input_shape = x.shape #get mask random_tensor = paddle.uniform(input_shape, dtype='float32', min=0., max=1.0) p = full(shape=[1], fill_value=p, dtype='float32') keep_mask = paddle.greater_equal(random_tensor, p) keep_mask = paddle.cast(keep_mask, dtype) drop_mask = paddle.subtract( full(shape=input_shape, fill_value=1., dtype=dtype), keep_mask) #apply mask b = full(shape=[1], fill_value=b, dtype=dtype) y = paddle.add(paddle.multiply(x, keep_mask), paddle.scale(drop_mask, scale=alpha_p)) res = paddle.add(paddle.scale(y, scale=a), b, name=name) return res else: # test return x def pad(x, pad, mode='constant', value=0, data_format="NCHW", name=None): """ Pad tensor according to 'pad' and 'mode'. If mode is 'constant' and length of pad is twice as length of x dimension, then the padding will be started from the first dimension and moved back onto x according to 'pad' and 'value'. If mode is 'reflect', pad[0] and pad[1] must be no greater than width-1. The height and depth dimension has the same condition. Parameters: x (Tensor): The input tensor with data type float32/double/int32/int64_t. pad (Tensor|list[int]|tuple[int]): The padding size with data type int. If mode is 'constant' and length of pad is twice as length of x dimension, then x will be padded from the first dimension to the last dimension. Else: 1. If input dimension is 3, then the pad has the form (pad_left, pad_right). 2. If the input dimension is 4, then the pad has the form (pad_left, pad_right, pad_top, pad_bottom). 3. If the input dimension is 5, then the pad has the form (pad_left, pad_right, pad_top, pad_bottom, pad_front, pad_back). mode (str, optional): Four modes: 'constant' (default), 'reflect', 'replicate', 'circular'. Default is 'constant' - 'constant' mode, uses a constant value to pad the input tensor. - 'reflect' mode, uses reflection of the input boundaries to pad the input tensor. - 'replicate' mode, uses input boundaries to pad the input tensor. - 'circular' mode, uses circular input to pad the input tensor. value (float, optional): The value to fill the padded areas in 'constant' mode . Default is :math:`0.0`， data_format (str, optional): An string from: "NCL", "NLC", NHWC", "NCHW", "NCDHW", "NDHWC". Specify the data format of the input data. Default is "NCHW"， name (str, optional): For details, please refer to :ref:`api_guide_Name`. Generally, no setting is required. Default: None. Returns: Tensor, a Tensor padded according to pad and mode and data type is same as input. Example: .. code-block:: text x = [[[[[1., 2., 3.], [4., 5., 6.]]]]] Case 0: pad = [0, 0, 0, 0, 0, 0, 1, 1, 0, 0], mode = 'constant' value = 0 Out = [[[[[0., 0., 0.], [1., 2., 3.], [4., 5., 6.], [0., 0., 0.]]]]] Case 1: pad = [2, 2, 1, 1, 0, 0], mode = 'constant' value = 0 Out = [[[[[0. 0. 0. 0. 0. 0. 0.] [0. 0. 1. 2. 3. 0. 0.] [0. 0. 4. 5. 6. 0. 0.] [0. 0. 0. 0. 0. 0. 0.]]]]] Case 2: pad = [2, 2, 1, 1, 0, 0], mode = 'reflect' Out = [[[[[6. 5. 4. 5. 6. 5. 4.] [3. 2. 1. 2. 3. 2. 1.] [6. 5. 4. 5. 6. 5. 4.] [3. 2. 1. 2. 3. 2. 1.]]]]] Case 3: pad = [2, 2, 1, 1, 0, 0], mode = 'replicate' Out = [[[[[1. 1. 1. 2. 3. 3. 3.] [1. 1. 1. 2. 3. 3. 3.] [4. 4. 4. 5. 6. 6. 6.] [4. 4. 4. 5. 6. 6. 6.]]]]] Case 4: pad = [2, 2, 1, 1, 0, 0], mode = 'circular' Out = [[[[[5. 6. 4. 5. 6. 4. 5.] [2. 3. 1. 2. 3. 1. 2.] [5. 6. 4. 5. 6. 4. 5.] [2. 3. 1. 2. 3. 1. 2.]]]]] Examples: .. code-block:: python import paddle import paddle.nn.functional as F # example 1 x_shape = (1, 1, 3) x = paddle.arange(paddle.prod(paddle.to_tensor(x_shape)), dtype="float32").reshape(x_shape) + 1 y = F.pad(x, [0, 0, 0, 0, 2, 3], value=1, mode='constant', data_format="NCL") print(y) # [[[1. 1. 1. 2. 3. 1. 1. 1.]]] # example 2 x_shape = (1, 1, 3) x = paddle.arange(paddle.prod(paddle.to_tensor(x_shape)), dtype="float32").reshape(x_shape) + 1 y = F.pad(x, [2, 3], value=1, mode='constant', data_format="NCL") print(y) # [[[1. 1. 1. 2. 3. 1. 1. 1.]]] # example 3 x_shape = (1, 1, 2, 3) x = paddle.arange(paddle.prod(paddle.to_tensor(x_shape)), dtype="float32").reshape(x_shape) + 1 y = F.pad(x, [1, 2, 1, 1], value=1, mode='circular') print(y) # [[[[6. 4. 5. 6. 4. 5.] # [3. 1. 2. 3. 1. 2.] # [6. 4. 5. 6. 4. 5.] # [3. 1. 2. 3. 1. 2.]]]] """ assert mode in ['reflect', 'replicate', 'constant', 'circular'], \ "mode should be one of constant, reflect, replicate, circular, but got {}.".format(mode) data_format = data_format.upper() assert data_format in ["NCL", "NCHW", "NCDHW", "NLC", "NHWC", "NDHWC"], \ "data_format should be in one of [NCL, NCHW, NCDHW, NLC, NHWC, NDHWC], " \ "but got {}".format(data_format) x_dim = len(x.shape) if mode == "constant" and isinstance( pad, (list, tuple)) and len(pad) == x_dim * 2: paddings = pad pad_value = value if in_dygraph_mode(): out = _C_ops.pad(x, paddings, float(pad_value)) return out check_variable_and_dtype(x, 'x', [ 'float16', 'float32', 'float64', 'int32', 'int64', 'complex64', 'complex128' ], "pad") check_type(pad_value, 'pad_value', (float, int, Variable), 'pad') if isinstance(pad_value, int): pad_value = float(pad_value) helper = LayerHelper('pad', **locals()) dtype = helper.input_dtype(input_param_name='x') out = helper.create_variable_for_type_inference(dtype) helper.append_op(type='pad', inputs={'X': x}, outputs={'Out': out}, attrs={ 'paddings': paddings, 'pad_value': pad_value }) return out assert x_dim in [ 3, 4, 5 ], "input tesor dimension must be in [3, 4, 5] but got {}".format(x_dim) supported_format_map = { 3: ["NCL", "NLC"], 4: ["NCHW", "NHWC"], 5: ["NCDHW", "NDHWC"], } assert data_format in supported_format_map[x_dim], \ "input tensor dimension is {}, it's data format should be in {} but got {}".format( x_dim, supported_format_map[x_dim], data_format) unsqueezed_dim = [] if isinstance(pad, Variable): if data_format in ["NCL", "NCHW", "NCDHW"]: data_format = "NCDHW" if x_dim == 3: pad = concat([zeros((4, ), dtype="int32"), pad], axis=0) unsqueezed_dim = [3, 4] x = unsqueeze(x, axis=unsqueezed_dim) elif x_dim == 4: pad = concat([pad, zeros((2, ), dtype="int32")], axis=0) unsqueezed_dim = [2] x = unsqueeze(x, axis=unsqueezed_dim) elif data_format in ["NLC", "NHWC", "NDHWC"]: data_format = "NDHWC" if x_dim == 3: pad = concat([zeros((4, ), dtype="int32"), pad], axis=0) unsqueezed_dim = [2, 3] x = unsqueeze(x, axis=unsqueezed_dim) elif x_dim == 4: pad = concat([pad, zeros((2, ), dtype="int32")], axis=0) unsqueezed_dim = [1] x = unsqueeze(x, axis=unsqueezed_dim) else: pad = list(pad) if data_format in ["NCL", "NCHW", "NCDHW"]: data_format = "NCDHW" if x_dim == 3: pad = [0, 0, 0, 0] + pad unsqueezed_dim = [3, 4] x = unsqueeze(x, axis=unsqueezed_dim) elif x_dim == 4: pad = pad + [0, 0] unsqueezed_dim = [2] x = unsqueeze(x, axis=unsqueezed_dim) elif data_format in ["NLC", "NHWC", "NDHWC"]: data_format = "NDHWC" if x_dim == 3: pad = [0, 0, 0, 0] + pad unsqueezed_dim = [2, 3] x = unsqueeze(x, axis=unsqueezed_dim) elif x_dim == 4: pad = pad + [0, 0] unsqueezed_dim = [1] x = unsqueeze(x, axis=unsqueezed_dim) if in_dygraph_mode(): if isinstance(pad, Variable): pad = pad.numpy().tolist() out = _C_ops.pad3d(x, pad, mode, value, data_format) else: if _in_legacy_dygraph(): if isinstance(pad, Variable): pad = pad.numpy().tolist() out = _legacy_C_ops.pad3d(x, "paddings", pad, "mode", mode, "value", value, "data_format", data_format, "name", name) else: attrs = {'mode': mode, 'value': value, 'data_format': data_format} inputs = {'X': [x]} if isinstance(pad, Variable): inputs['Paddings'] = [pad] attrs['paddings'] = [] else: attrs['paddings'] = pad helper = LayerHelper('pad3d', **locals()) dtype = helper.input_dtype(input_param_name='input') out = helper.create_variable_for_type_inference(dtype) helper.append_op(type='pad3d', inputs=inputs, outputs={"Out": out}, attrs=attrs) if len(unsqueezed_dim) != 0: out = squeeze(out, axis=unsqueezed_dim) return out def zeropad2d(x, padding, data_format="NCHW", name=None): """ Pads the input tensor boundaries with zero according to 'pad'. Args: x(Tensor): The input tensor with data type float16/float32/float64/int32/int64. padding(int | Tensor | List[int] | Tuple[int]): The padding size with data type int. The input dimension should be 4 and pad has the form (pad_left, pad_right, pad_top, pad_bottom). data_format(str, optional): An string from: "NHWC", "NCHW". Specify the data format of the input data. Default: "NCHW". name(str, optional): The default value is None. Normally there is no need for user to set this property. Returns: Tensor, padded with 0 according to pad and data type is same as input. Examples: .. code-block:: python import paddle import numpy as np import paddle.nn.functional as F x_shape = (1, 1, 2, 3) x = paddle.arange(np.prod(x_shape), dtype="float32").reshape(x_shape) + 1 y = F.zeropad2d(x, [1, 2, 1, 1]) # [[[[0. 0. 0. 0. 0. 0.] # [0. 1. 2. 3. 0. 0.] # [0. 4. 5. 6. 0. 0.] # [0. 0. 0. 0. 0. 0.]]]] """ return pad(x, pad=padding, mode='constant', value=0, data_format=data_format, name=name) def cosine_similarity(x1, x2, axis=1, eps=1e-8): """ Compute cosine similarity between x1 and x2 along axis. Parameters: x1 (Tensor): First input. float32/double. x2 (Tensor): Second input. float32/double. axis (int, optional): Dimension of vectors to compute cosine similarity. Default is 1. eps(float, optional): Small value to avoid division by zero. Default is 1e-8. Returns: Tensor, a Tensor representing cosine similarity between x1 and x2 along axis. Examples: .. code-block:: text Case 0: x1 = [[0.8024077 0.9927354 0.27238318 0.8344984 ] [0.48949873 0.5797396 0.65444374 0.66510963] [0.1031398 0.9614342 0.08365563 0.6796464 ] [0.10760343 0.7461209 0.7726148 0.5801006 ]] x2 = [[0.62913156 0.1536727 0.9847992 0.04591406] [0.9098952 0.15715368 0.8671125 0.3156102 ] [0.4427798 0.54136837 0.5276275 0.32394758] [0.3769419 0.8535014 0.48041078 0.9256797 ]] axis = 1 eps = 1e-8 Out: [0.5275037 0.8368967 0.75037485 0.9245899] Code Examples: .. code-block:: python import paddle import paddle.nn as nn paddle.seed(1) x1 = paddle.randn(shape=[2, 3]) x2 = paddle.randn(shape=[2, 3]) result = paddle.nn.functional.cosine_similarity(x1, x2, axis=0) print(result) # [0.97689527, 0.99996042, -0.55138415] """ w12 = sum(paddle.multiply(x1, x2), axis=axis) w1 = sum(paddle.multiply(x1, x1), axis=axis) w2 = sum(paddle.multiply(x2, x2), axis=axis) n12 = sqrt(clip(w1 * w2, min=eps * eps)) cos_sim = w12 / n12 return cos_sim def linear(x, weight, bias=None, name=None): r""" Fully-connected linear transformation operator. For each input :math:`X` , the equation is: .. math:: Out = XW + b where :math:`W` is the weight and :math:`b` is the bias. If the weight is a 2-D tensor of shape :math:`[in\_features, out\_features]` , input should be a multi-dimensional tensor of shape :math:`[batch\_size, *, in\_features]` , where :math:`*` means any number of additional dimensions. The linear operator multiplies input tensor with weight and produces an output tensor of shape :math:`[batch\_size, *, out\_features]` , If :math:`bias` is not None, the bias should be a 1-D tensor of shape :math:`[out\_features]` and will be added to the output. Parameters: x (Tensor): Input tensor. The data type should be float16, float32 or float64. weight (Tensor): Weight tensor. The data type should be float16, float32 or float64. bias (Tensor, optional): Bias tensor. The data type should be float16, float32 or float64. If it is set to None, no bias will be added to the output units. name (str, optional): Normally there is no need for user to set this parameter. For detailed information, please refer to :ref:`api_guide_Name` . Returns: Tensor, the shape is :math:`[batch\_size, *, out\_features]` and the data type is the same with input :math:`x` . Examples: .. code-block:: python import paddle x = paddle.randn((3, 2), dtype="float32") # x: [[-0.32342386 -1.200079 ] # [ 0.7979031 -0.90978354] # [ 0.40597573 1.8095392 ]] weight = paddle.full(shape=[2, 4], fill_value="0.5", dtype="float32", name="weight") # weight: [[0.5 0.5 0.5 0.5] # [0.5 0.5 0.5 0.5]] bias = paddle.ones(shape=[4], dtype="float32", name="bias") # bias: [1. 1. 1. 1.] y = paddle.nn.functional.linear(x, weight, bias) # y: [[0.23824859 0.23824859 0.23824859 0.23824859] # [0.9440598 0.9440598 0.9440598 0.9440598 ] # [2.1077576 2.1077576 2.1077576 2.1077576 ]] """ if in_dygraph_mode(): #TODO(jiabin): using addmm for fast forward route return _C_ops.linear(x, weight, bias) else: if _in_legacy_dygraph(): pre_bias = _legacy_C_ops.matmul_v2(x, weight, 'trans_x', False, 'trans_y', False) if bias is None: return pre_bias return _legacy_C_ops.elementwise_add(pre_bias, bias) else: helper = LayerHelper('linear', **locals()) dtype = x.dtype check_variable_and_dtype(x, 'x', ['float16', 'float32', 'float64'], 'linear') check_dtype(dtype, 'dtype', ['float16', 'float32', 'float64'], 'linear') inputs = {'X': [x], 'Y': [weight]} attrs = {'trans_x': False, 'trans_y': False} tmp = helper.create_variable_for_type_inference(dtype) helper.append_op(type='matmul_v2', inputs=inputs, outputs={'Out': tmp}, attrs=attrs) if bias is not None: res = helper.create_variable_for_type_inference(dtype) helper.append_op(type='elementwise_add', inputs={ 'X': [tmp], 'Y': [bias] }, outputs={'Out': [res]}, attrs={'axis': len(x.shape) - 1}) else: res = tmp return res def label_smooth(label, prior_dist=None, epsilon=0.1, name=None): r""" Label smoothing is a mechanism to regularize the classifier layer and is called label-smoothing regularization (LSR).Label smoothing is proposed to encourage the model to be less confident, since optimizing the log-likelihood of the correct label directly may cause overfitting and reduce the ability of the model to adapt. Label smoothing replaces the ground-truth label :math:`y` with the weighted sum of itself and some fixed distribution :math:`\mu`. For class :math:`k`, i.e. .. math:: \\tilde{y_k} = (1 - \epsilon) * y_k + \epsilon * \mu_k, where :math:`1 - \epsilon` and :math:`\epsilon` are the weights respectively, and :math:`\\tilde{y}_k` is the smoothed label. Usually uniform distribution is used for :math:`\mu`. See more details about label smoothing in https://arxiv.org/abs/1512.00567. Parameters: label(Tensor): The input variable containing the label data. The label data should use one-hot representation. It's a multidimensional tensor with a shape of :math:`[N_1, ..., Depth]`, where Depth is class number. The dtype can be "float32" and "float64". prior_dist(Tensor, optional): The prior distribution to be used to smooth labels. If not provided, an uniform distribution is used. It's a multidimensional tensor with a shape of :math:`[1, class\_num]` . The default value is None. epsilon(float, optional): The weight used to mix up the original ground-truth distribution and the fixed distribution. The default value is 0.1. name(str, optional): The default value is None. Normally there is no need for user to set this property. For more information, please refer to :ref:`api_guide_Name`. Returns: Tensor: The tensor containing the smoothed labels. Examples: .. code-block:: python import paddle import numpy as np x_data = np.array([[[0, 1, 0], [ 1, 0, 1]]]).astype("float32") print(x_data.shape) paddle.disable_static() x = paddle.to_tensor(x_data, stop_gradient=False) output = paddle.nn.functional.label_smooth(x) print(output) #[[[0.03333334 0.93333334 0.03333334] # [0.93333334 0.03333334 0.93333334]]] """ if epsilon > 1. or epsilon < 0.: raise ValueError("The value of epsilon must be between 0 and 1.") if in_dygraph_mode(): return _C_ops.label_smooth(label, prior_dist, float(epsilon)) elif paddle.in_dynamic_mode(): return _legacy_C_ops.label_smooth(label, prior_dist, 'epsilon', float(epsilon)) check_variable_and_dtype(label, 'label', ['float32', 'float64'], 'label_smooth') helper = LayerHelper("label_smooth", **locals()) label.stop_gradient = True smooth_label = helper.create_variable_for_type_inference(label.dtype) helper.append_op(type="label_smooth", inputs={ "X": label, "PriorDist": prior_dist } if prior_dist else {"X": label}, outputs={"Out": smooth_label}, attrs={"epsilon": float(epsilon)}) return smooth_label def class_center_sample(label, num_classes, num_samples, group=None): """ Class center sample method is proposed from the paper PartialFC that only sample a subset of the class centers. The process of sampling subset class centers is straightforward: 1. First select the positive class centers; 2. Then randomly sample negative class centers. Specifically, given a label tensor, shape [batch_size], select all the positive class centers and randomly sample negative class centers, then remap the input label tensor using the sampled class centers. For more information, Partial FC: Training 10 Million Identities on a Single Machine arxiv: https://arxiv.org/abs/2010.05222 .. hint:: If the number of the positive class centers is greater than the input num_samples, it keeps all the positive class centers and the shape of sampled_class_center will be [num_positive_class_centers]. The API supports CPU, single GPU and multi GPU. For data parallel mode, set ``group=False``. For model parallel mode, set ``group=None`` or the group instance return by paddle.distributed.new_group. Args: label (Tensor): 1-D tensor with shape [N], each label in [0, num_classes) num_classes (int): A positive integer to specify the number of classes at local rank. Note that num_classes of each GPU can be different. num_samples (int): A positive integer to specify the number of class center to sample. group (Group, optional): The group instance return by paddle.distributed.new_group or ``None`` for global default group or ``False`` for data parallel (do not communication cross ranks). Default is ``None``. Returns: Tuple of two ``Tensor`` : (remapped_label, sampled_class_center), remapped label using sampled class center, sampled class center from [0, num_classes). Examples: .. code-block:: python :name: code-example1 # CPU or single GPU import paddle num_classes = 20 batch_size = 10 num_samples = 6 label = paddle.randint(low=0, high=num_classes, shape=[batch_size], dtype='int64') remapped_label, sampled_class_index = paddle.nn.functional.class_center_sample(label, num_classes, num_samples) print(label) print(remapped_label) print(sampled_class_index) # the output is #Tensor(shape=[10], dtype=int64, place=CPUPlace, stop_gradient=True, # [11, 5 , 1 , 3 , 12, 2 , 15, 19, 18, 19]) #Tensor(shape=[10], dtype=int64, place=CPUPlace, stop_gradient=True, # [4, 3, 0, 2, 5, 1, 6, 8, 7, 8]) #Tensor(shape=[9], dtype=int64, place=CPUPlace, stop_gradient=True, # [1 , 2 , 3 , 5 , 11, 12, 15, 18, 19]) .. code-block:: python :name: code-example2 # required: distributed # Multi GPU, test_class_center_sample.py import paddle import paddle.distributed as dist strategy = dist.fleet.DistributedStrategy() dist.fleet.init(is_collective=True, strategy=strategy) batch_size = 10 num_samples = 6 rank_id = dist.get_rank() # num_classes of each GPU can be different, e.g num_classes_list = [10, 8] num_classes_list = [10, 10] num_classes = paddle.sum(paddle.to_tensor(num_classes_list)) label = paddle.randint(low=0, high=num_classes.item(), shape=[batch_size], dtype='int64') label_list = [] dist.all_gather(label_list, label) label = paddle.concat(label_list, axis=0) remapped_label, sampled_class_index = paddle.nn.functional.class_center_sample(label, num_classes_list[rank_id], num_samples) print(label) print(remapped_label) print(sampled_class_index) #python -m paddle.distributed.launch --gpus=0,1 test_class_center_sample.py # rank 0 output: #Tensor(shape=[20], dtype=int64, place=CUDAPlace(0), stop_gradient=True, # [10, 17, 15, 11, 9 , 12, 18, 18, 17, 18, 19, 2 , 8 , 13, 11, 13, 9 , 10, 0 , 4 ]) #Tensor(shape=[20], dtype=int64, place=CUDAPlace(0), stop_gradient=True, # [6 , 11, 10, 7 , 4 , 8 , 12, 12, 11, 12, 13, 1 , 3 , 9 , 7 , 9 , 4 , 6 , 0 , 2 ]) #Tensor(shape=[6], dtype=int64, place=CUDAPlace(0), stop_gradient=True, # [0, 2, 4, 8, 9, 3]) # rank 1 output: #Tensor(shape=[20], dtype=int64, place=CUDAPlace(1), stop_gradient=True, # [10, 17, 15, 11, 9 , 12, 18, 18, 17, 18, 19, 2 , 8 , 13, 11, 13, 9 , 10, 0 , 4 ]) #Tensor(shape=[20], dtype=int64, place=CUDAPlace(1), stop_gradient=True, # [6 , 11, 10, 7 , 4 , 8 , 12, 12, 11, 12, 13, 1 , 3 , 9 , 7 , 9 , 4 , 6 , 0 , 2 ]) #Tensor(shape=[7], dtype=int64, place=CUDAPlace(1), stop_gradient=True, # [0, 1, 2, 3, 5, 7, 8]) """ if not (group == False or group is None or hasattr(group, 'is_member')): raise ValueError( 'Expected group is False, None or instance of paddle.distributed.collective.Group \ (got group: {})'.format(group)) return if hasattr(group, 'is_member') and not group.is_member(): return ring_id = 0 rank = 0 nranks = 1 if group != False: if core.is_compiled_with_dist(): parallel_env = paddle.distributed.ParallelEnv() global_rank = parallel_env.rank rank = global_rank if group is None else group.get_group_rank( global_rank) nranks = parallel_env.world_size if group is None else group.nranks if num_samples > num_classes: raise ValueError( 'Expected num_samples less than or equal to {}, got num_samples {}'. format(num_classes, num_samples)) label_size = 1 for dim in list(label.shape): label_size *= dim if label_size != -1 and label_size < 1: raise ValueError('Expected label_size > 0 \ (got label_size: {})'.format(label_size)) label_dims = len(list(label.shape)) if label_dims != 1: raise ValueError('Expected label_dims == 1 \ (got label_dims: {})'.format(label_dims)) seed = None if (seed is None or seed == 0) and default_main_program().random_seed != 0: seed = default_main_program().random_seed if in_dygraph_mode(): return _C_ops.class_center_sample(label, num_classes, num_samples, ring_id, rank, nranks, seed is not None, seed if seed is not None else 0) elif paddle.in_dynamic_mode(): remapped_label, sampled_class_center = _legacy_C_ops.class_center_sample( label, 'num_classes', num_classes, 'num_samples', num_samples, 'ring_id', ring_id, 'nranks', nranks, 'rank', rank, 'fix_seed', seed is not None, 'seed', seed if seed is not None else 0) return remapped_label, sampled_class_center check_variable_and_dtype(label, 'label', ['int64', 'int32'], 'class_center_sample') op_type = 'class_center_sample' helper = LayerHelper(op_type, **locals()) remapped_label = helper.create_variable_for_type_inference( dtype=label.dtype) sampled_class_center = helper.create_variable_for_type_inference( dtype=label.dtype) helper.append_op(type=op_type, inputs={'Label': label}, outputs={ 'RemappedLabel': remapped_label, 'SampledLocalClassCenter': sampled_class_center }, attrs={ 'num_classes': num_classes, 'num_samples': num_samples, 'ring_id': ring_id, 'nranks': nranks, 'rank': rank, 'fix_seed': seed is not None, 'seed': seed if seed is not None else 0 }) return remapped_label, sampled_class_center def fold(x, output_sizes, kernel_sizes, strides=1, paddings=0, dilations=1, name=None): r""" Combines an array of sliding local blocks into a large containing tensor. also known as col2im when operated on batched 2D image tensor. Fold calculates each combined value in the resulting large tensor by summing all values from all containing blocks. For each input :math:`x` with shape [N, C_in , L], the output shape [N, C_out, H_out, W_out] can be calculated as following. .. math:: H_{out} &= output\_size[0] \\ W_{out} &= output\_size[1] \\ C_{out} &= \frac{C_{in}}{kernel\_sizes[0]\times kernel\_sizes[1]} \\ Parameters: x(Tensor): 3-D Tensor, input tensor of format [N, C, L], data type can be float32 or float64 output_sizes(int|list|tuple): The size of output size, should be [output_size_h, output_size_w] or an interger o treated as [o, o]. kernel_sizes(int|list|tuple): The size of convolution kernel, should be [k_h, k_w] or an integer k treated as [k, k]. strides(int|list|tuple, optional): The strides, should be [stride_h, stride_w] or an integer stride treated as [sride, stride]. For default, strides will be [1, 1]. paddings(int|list|tuple, optional): The paddings of each dimension, should be [padding_top, padding_left, padding_bottom, padding_right] or [padding_h, padding_w] or an integer padding. If [padding_h, padding_w] was given, it will expanded to [padding_h, padding_w, padding_h, padding_w]. If an integer padding was given, [padding, padding, padding, padding] will be used. For default, paddings will be [0, 0, 0, 0] dilations(int|list|tuple, optional): the dilations of convolution kernel, should be [dilation_h, dilation_w], or an integer dilation treated as [dilation, dilation]. For default, it will be [1, 1]. name(str, optional): The default value is None. Normally there is no need for user to set this property. For more information, please refer to :ref:`api_guide_Name` Returns: The tensor formed by combining a group of sliding local blocks The output shape is [N, Cout, H, W] as decriabled above. Examples: .. code-block:: python import paddle import paddle.nn.functional as F x = paddle.randn([2,3*2*2,12]) y = F.fold(x, output_sizes=[4, 5], kernel_sizes=2) # y.shape = [2,3,4,5] """ helper = LayerHelper("fold", **locals()) check_variable_and_dtype(x, 'x', ['float32', 'float64'], 'fold') assert len(x.shape) == 3, \ "input should be the format of [N, C, L]" def _is_list_or_turple_(data): return (isinstance(data, list) or isinstance(data, tuple)) if isinstance(output_sizes, int): output_sizes = [output_sizes, output_sizes] else: assert _is_list_or_turple_(output_sizes) and (len(output_sizes) == 2), \ "output_sizes should either be an integer or a list/tuple of two integers" if isinstance(kernel_sizes, int): kernel_sizes = [kernel_sizes, kernel_sizes] else: assert _is_list_or_turple_(kernel_sizes) and (len(kernel_sizes) == 2), \ "kernel_sizes should either be an integer or a list/tuple of two integers" if isinstance(strides, int): strides = [strides, strides] else: assert _is_list_or_turple_(strides) and (len(strides) == 2), \ "strides should either be an integer or a list/tuple of two integers" if isinstance(dilations, int): dilations = [dilations, dilations] else: assert _is_list_or_turple_(dilations) and (len(dilations) == 2), \ "dilations should either be an integer or a list/tuple of two integers" if isinstance(paddings, int): paddings = [paddings] * 4 elif isinstance(paddings, list): if len(paddings) == 2: paddings = paddings * 2 elif len(paddings) == 4: pass else: raise ValueError( "paddings should either be an integer or a list of 2 or 4 integers" ) else: raise ValueError( "Unexpected type of paddings, it should be either an integer or a list" "of 2 or 4 integers") if in_dygraph_mode(): out = _C_ops.fold(x, output_sizes, kernel_sizes, strides, paddings, dilations) elif in_dynamic_mode(): out = _legacy_C_ops.fold(x, "output_sizes", output_sizes, "kernel_sizes", kernel_sizes, "strides", strides, "paddings", paddings, "dilations", dilations) else: out = helper.create_variable_for_type_inference(dtype=x.dtype) helper.append_op(type="fold", inputs={"X": x}, outputs={"Y": out}, attrs={ "output_sizes": output_sizes, "kernel_sizes": kernel_sizes, "strides": strides, "paddings": paddings, "dilations": dilations }) return out