tf.feature_column.sequence_categorical_column_with_vocabulary_list
A sequence of categorical terms where ids use an in-memory list.
tf.feature_column.sequence_categorical_column_with_vocabulary_list(
key, vocabulary_list, dtype=None, default_value=-1, num_oov_buckets=0
)
Pass this to embedding_column or indicator_column to convert sequence categorical data into dense representation for input to sequence NN, such as RNN.
Example:
colors = sequence_categorical_column_with_vocabulary_list(
key='colors', vocabulary_list=('R', 'G', 'B', 'Y'),
num_oov_buckets=2)
colors_embedding = embedding_column(colors, dimension=3)
columns = [colors_embedding]
features = tf.io.parse_example(..., features=make_parse_example_spec(columns))
sequence_feature_layer = SequenceFeatures(columns)
sequence_input, sequence_length = sequence_feature_layer(features)
sequence_length_mask = tf.sequence_mask(sequence_length)
rnn_cell = tf.keras.layers.SimpleRNNCell(hidden_size)
rnn_layer = tf.keras.layers.RNN(rnn_cell)
outputs, state = rnn_layer(sequence_input, mask=sequence_length_mask)
| Args |
|---|
key | A unique string identifying the input feature. |
vocabulary_list | An ordered iterable defining the vocabulary. Each feature is mapped to the index of its value (if present) in vocabulary_list. Must be castable to dtype. |
dtype | The type of features. Only string and integer types are supported. If None, it will be inferred from vocabulary_list. |
default_value | The integer ID value to return for out-of-vocabulary feature values, defaults to -1. This can not be specified with a positive num_oov_buckets. |
num_oov_buckets | Non-negative integer, the number of out-of-vocabulary buckets. All out-of-vocabulary inputs will be assigned IDs in the range [len(vocabulary_list), len(vocabulary_list)+num_oov_buckets) based on a hash of the input value. A positive num_oov_buckets can not be specified with default_value. |
| Returns |
|---|
A SequenceCategoricalColumn. |
| Raises |
|---|
ValueError | if vocabulary_list is empty, or contains duplicate keys. |
ValueError | num_oov_buckets is a negative integer. |
ValueError | num_oov_buckets and default_value are both specified. |
ValueError | if dtype is not integer or string. |