ft_word2vec

From sparklyr v0.8.2 by Javier Luraschi

Feature Tranformation -- Word2Vec (Estimator)

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

Usage

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

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.
dataset: (Optional) A tbl_spark. If provided, eagerly fit the (estimator) feature "transformer" against dataset. See details.
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

When dataset is provided for an estimator transformer, the function internally calls ml_fit() against dataset. Hence, the methods for spark_connection and ml_pipeline will then return a ml_transformer and a ml_pipeline with a ml_transformer appended, respectively. When x is a tbl_spark, the estimator will be fit against dataset before transforming x.

When dataset is not specified, the constructor returns a ml_estimator, and, in the case where x is a tbl_spark, the estimator fits against x then to obtain a transformer, which is then immediately used to transform x.

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

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, ft_pca, ft_polynomial_expansion, ft_quantile_discretizer, ft_r_formula, ft_regex_tokenizer, ft_sql_transformer, ft_standard_scaler, ft_stop_words_remover, ft_string_indexer, ft_tokenizer, ft_vector_assembler, ft_vector_indexer, ft_vector_slicer

Documentation reproduced from package sparklyr, version 0.8.2, License: Apache License 2.0 | file LICENSE

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