sparklyr (version 1.8.4)

ft_word2vec: Feature Transformation -- Word2Vec (Estimator)

Description

Word2Vec transforms a word into a code for further natural language processing or machine learning process.

Usage

ft_word2vec(
  x,
  input_col = NULL,
  output_col = NULL,
  vector_size = 100,
  min_count = 5,
  max_sentence_length = 1000,
  num_partitions = 1,
  step_size = 0.025,
  max_iter = 1,
  seed = NULL,
  uid = random_string("word2vec_"),
  ...
)
ml_find_synonyms(model, word, num)

Value

The object returned depends on the class of x.

• spark_connection: When x is a spark_connection, the function returns a ml_transformer, a ml_estimator, or one of their subclasses. The object contains a pointer to a Spark Transformer or Estimator object and can be used to compose Pipeline objects.

• ml_pipeline: When x is a ml_pipeline, the function returns a ml_pipeline with the transformer or estimator appended to the pipeline.

• tbl_spark: When x is a tbl_spark, a transformer is constructed then immediately applied to the input tbl_spark, returning a tbl_spark

ml_find_synonyms() returns a DataFrame of synonyms and cosine similarities

Arguments

x

A spark_connection, ml_pipeline, or a tbl_spark.

input_col

The name of the input column.

output_col

The name of the output column.

vector_size

The dimension of the code that you want to transform from words. Default: 100

min_count

The minimum number of times a token must appear to be included in the word2vec model's vocabulary. Default: 5

max_sentence_length

(Spark 2.0.0+) Sets the maximum length (in words) of each sentence in the input data. Any sentence longer than this threshold will be divided into chunks of up to max_sentence_length size. Default: 1000

num_partitions

Number of partitions for sentences of words. Default: 1

step_size

Param for Step size to be used for each iteration of optimization (> 0).

max_iter

The maximum number of iterations to use.

seed

A random seed. Set this value if you need your results to be reproducible across repeated calls.

uid

A character string used to uniquely identify the feature transformer.

...

Optional arguments; currently unused.

model

A fitted Word2Vec model, returned by ft_word2vec().

word

A word, as a length-one character vector.

num

Number of words closest in similarity to the given word to find.

Details

In the case where x is a tbl_spark, the estimator fits against x to obtain a transformer, which is then immediately used to transform x, returning a tbl_spark.

See Also

See https://spark.apache.org/docs/latest/ml-features.html for more information on the set of transformations available for DataFrame columns in Spark.

Other feature transformers: ft_binarizer(), ft_bucketizer(), ft_chisq_selector(), ft_count_vectorizer(), ft_dct(), ft_elementwise_product(), ft_feature_hasher(), ft_hashing_tf(), ft_idf(), ft_imputer(), ft_index_to_string(), ft_interaction(), ft_lsh, ft_max_abs_scaler(), ft_min_max_scaler(), ft_ngram(), ft_normalizer(), ft_one_hot_encoder_estimator(), ft_one_hot_encoder(), ft_pca(), ft_polynomial_expansion(), ft_quantile_discretizer(), ft_r_formula(), ft_regex_tokenizer(), ft_robust_scaler(), ft_sql_transformer(), ft_standard_scaler(), ft_stop_words_remover(), ft_string_indexer(), ft_tokenizer(), ft_vector_assembler(), ft_vector_indexer(), ft_vector_slicer()