tf.keras.layers.ZeroPadding2D

Zero-padding layer for 2D input (e.g. picture).

Inherits From: Layer, Operation

Used in the notebooks

This layer can add rows and columns of zeros at the top, bottom, left and right side of an image tensor.

Example:

input_shape = (1, 1, 2, 2)
x = np.arange(np.prod(input_shape)).reshape(input_shape)
x
[[[[0 1]
   [2 3]]]]
y = keras.layers.ZeroPadding2D(padding=1)(x)
y
[[[[0 0]
   [0 0]
   [0 0]
   [0 0]]
  [[0 0]
   [0 1]
   [2 3]
   [0 0]]
  [[0 0]
   [0 0]
   [0 0]
   [0 0]]]]

padding Int, or tuple of 2 ints, or tuple of 2 tuples of 2 ints.

  • If int: the same symmetric padding is applied to height and width.
  • If tuple of 2 ints: interpreted as two different symmetric padding values for height and width: (symmetric_height_pad, symmetric_width_pad).
  • If tuple of 2 tuples of 2 ints: interpreted as ((top_pad, bottom_pad), (left_pad, right_pad)).
data_format A string, one of "channels_last" (default) or "channels_first". The ordering of the dimensions in the inputs. "channels_last" corresponds to inputs with shape (batch_size, height, width, channels) while "channels_first" corresponds to inputs with shape (batch_size, channels, height, width). When unspecified, uses image_data_format value found in your Keras config file at ~/.keras/keras.json (if exists). Defaults to "channels_last".

4D tensor with shape:

  • If data_format is "channels_last": (batch_size, height, width, channels)
  • If data_format is "channels_first": (batch_size, channels, height, width)

4D tensor with shape:

  • If data_format is "channels_last": (batch_size, padded_height, padded_width, channels)
  • If data_format is "channels_first": (batch_size, channels, padded_height, padded_width)

input Retrieves the input tensor(s) of a symbolic operation.

Only returns the tensor(s) corresponding to the first time the operation was called.

output Retrieves the output tensor(s) of a layer.

Only returns the tensor(s) corresponding to the first time the operation was called.

Methods

from_config

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Creates a layer from its config.

This method is the reverse of get_config, capable of instantiating the same layer from the config dictionary. It does not handle layer connectivity (handled by Network), nor weights (handled by set_weights).

Args
config A Python dictionary, typically the output of get_config.

Returns
A layer instance.

symbolic_call

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