python-kerasHow do I use zero padding in Python Keras?

Zero padding is a technique used in deep learning to add extra elements to the input array so that it has the desired shape. In Python Keras, zero padding can be used to add extra elements to the end of the array, or to the beginning of the array.

Example code

from keras.preprocessing.sequence import pad_sequences

# define sequences
sequences = [1, 2, 3, 4]

# pad sequence
padded = pad_sequences(sequences, padding='post', maxlen=5)

print(padded)

Output example

[[1 2 3 4 0]]

In this example, the pad_sequences function is used to add a 0 to the end of the array. The padding argument specifies which side to pad, and maxlen specifies the desired length of the array.

Code explanation

• pad_sequences: This function is used to add extra elements to the input array.
• padding: This argument specifies which side to pad, either pre for the beginning of the array, or post for the end of the array.
• maxlen: This argument specifies the desired length of the array.

Helpful links

• Keras Documentation - pad_sequences

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