adaptive_avg_pool1d¶

paddle.nn.functional. adaptive_avg_pool1d ( x, output_size, name=None ) [source]

Adaptive average pooling 1d operation on x according to output_size.

Notes

See more details in api_nn_pooling_AdaptiveAvgPool1d .

Parameters

• x (Tensor) – The input Tensor of pooling, which is a 3-D tensor with shape \([N, C, L]\), where \(N\) is batch size, \(C\) is the number of channels and \(L\) is the length of the feature. The data type is float32 or float64.

• output_size (int) – The target output size. Its data type must be int.

• name (str, optional) – For details, please refer to Name. Generally, no setting is required. Default: None.

Returns

The result of 1D adaptive average pooling. Its data type is same as input.

Return type

Tensor

Examples

# average adaptive pool1d
# suppose input data in shape of [N, C, L], `output_size` is m or [m],
# output shape is [N, C, m], adaptive pool divide L dimension
# of input data into m grids averagely and performs poolings in each
# grid to get output.
# adaptive max pool performs calculations as follow:
#
#     for i in range(m):
#         lstart = floor(i * L / m)
#         lend = ceil((i + 1) * L / m)
#         output[:, :, i] = sum(input[:, :, lstart: lend])/(lstart - lend)
#
import paddle
import paddle.nn.functional as F

data = paddle.uniform([1, 3, 32])
pool_out = F.adaptive_avg_pool1d(data, output_size=16)
# pool_out shape: [1, 3, 16])