pad_sequences: Pad a linear sequence for an RNN input

In kerasR: R Interface to the Keras Deep Learning Library

Pad a linear sequence for an RNN input

Description

Transform a list of num_samples sequences (lists of scalars) into a 2D Numpy array of shape (num_samples, num_timesteps). num_timesteps is either the maxlen argument if provided, or the length of the longest sequence otherwise. Sequences that are shorter than num_timesteps are padded with value at the end. Sequences longer than num_timesteps are truncated so that it fits the desired length. Position where padding or truncation happens is determined by padding or truncating, respectively.

Usage

pad_sequences(sequences, maxlen = NULL, dtype = "int32", padding = "pre",
  truncating = "pre", value = 0)

Arguments

sequences	vector of lists of int or float.
maxlen	None or int. Maximum sequence length, longer sequences are truncated and shorter sequences are padded with zeros at the end.
dtype	datatype of the Numpy array returned.
padding	'pre' or 'post', pad either before or after each sequence.
truncating	'pre' or 'post', remove values from sequences larger than maxlen either in the beginning or in the end of the sequence
value	float, value to pad the sequences to the desired value.

Author(s)

Taylor B. Arnold, [e-mail]

References

Chollet, Francois. 2015. Keras: Deep Learning library for Theano and TensorFlow.

See Also

Other preprocessing: Tokenizer, expand_dims, img_to_array, load_img, one_hot, text_to_word_sequence

kerasR documentation built on Aug. 17, 2022, 5:06 p.m.