UpSampling2D 类keras.layers.UpSampling2D(
size=(2, 2), data_format=None, interpolation="nearest", **kwargs
)
用于2D输入的上采样层。
该实现使用插值重采样,由interpolation参数指定。使用interpolation=nearest重复数据的行和列。
示例
>>> input_shape = (2, 2, 1, 3)
>>> x = np.arange(np.prod(input_shape)).reshape(input_shape)
>>> print(x)
[[[[ 0 1 2]]
[[ 3 4 5]]]
[[[ 6 7 8]]
[[ 9 10 11]]]]
>>> y = keras.layers.UpSampling2D(size=(1, 2))(x)
>>> print(y)
[[[[ 0 1 2]
[ 0 1 2]]
[[ 3 4 5]
[ 3 4 5]]]
[[[ 6 7 8]
[ 6 7 8]]
[[ 9 10 11]
[ 9 10 11]]]]
参数
"channels_last"(默认)或"channels_first"。输入中的维度顺序。"channels_last"对应于形状为(batch_size, height, width, channels)的输入,而"channels_first"对应于形状为(batch_size, channels, height, width)的输入。如果未指定,则使用Keras配置文件~/.keras/keras.json中的image_data_format值(如果存在),否则默认为"channels_last"。默认为"channels_last"。"bicubic", "bilinear", "lanczos3", "lanczos5", "nearest"。输入形状
形状为 4D 张量: - 如果 data_format 为 "channels_last":(batch_size, rows, cols, channels) - 如果 data_format 为 "channels_first":(batch_size, channels, rows, cols)
输出形状
4D张量,形状如下:- 如果data_format是"channels_last":(batch_size, upsampled_rows, upsampled_cols, channels) - 如果data_format是"channels_first":(batch_size, channels, upsampled_rows, upsampled_cols)