From 3f52e1233531bf09976f4bdb33dd001f9e023882 Mon Sep 17 00:00:00 2001
From: Paul O'Leary McCann <polm@dampfkraft.com>
Date: Sun, 16 Jun 2019 20:24:06 +0900
Subject: [PATCH] Change vector training to work with latest gensim (fix #3749)
 (#3757)

---
 bin/train_word_vectors.py | 51 ++++++++++-----------------------------
 1 file changed, 13 insertions(+), 38 deletions(-)

diff --git a/bin/train_word_vectors.py b/bin/train_word_vectors.py
index 8482a7a55..624e339a0 100644
--- a/bin/train_word_vectors.py
+++ b/bin/train_word_vectors.py
@@ -13,23 +13,21 @@ logger = logging.getLogger(__name__)
 
 
 class Corpus(object):
-    def __init__(self, directory, min_freq=10):
+    def __init__(self, directory, nlp):
         self.directory = directory
-        self.counts = PreshCounter()
-        self.strings = {}
-        self.min_freq = min_freq
-
-    def count_doc(self, doc):
-        # Get counts for this document
-        for word in doc:
-            self.counts.inc(word.orth, 1)
-        return len(doc)
+        self.nlp = nlp
 
     def __iter__(self):
         for text_loc in iter_dir(self.directory):
             with text_loc.open("r", encoding="utf-8") as file_:
                 text = file_.read()
-            yield text
+
+            # This is to keep the input to the blank model (which doesn't
+            # sentencize) from being too long. It works particularly well with
+            # the output of [WikiExtractor](https://github.com/attardi/wikiextractor)
+            paragraphs = text.split('\n\n')
+            for par in paragraphs:
+                yield [word.orth_ for word in self.nlp(par)]
 
 
 def iter_dir(loc):
@@ -62,12 +60,15 @@ def main(
     window=5,
     size=128,
     min_count=10,
-    nr_iter=2,
+    nr_iter=5,
 ):
     logging.basicConfig(
         format="%(asctime)s : %(levelname)s : %(message)s", level=logging.INFO
     )
+    nlp = spacy.blank(lang)
+    corpus = Corpus(in_dir, nlp)
     model = Word2Vec(
+        sentences=corpus,
         size=size,
         window=window,
         min_count=min_count,
@@ -75,33 +76,7 @@ def main(
         sample=1e-5,
         negative=negative,
     )
-    nlp = spacy.blank(lang)
-    corpus = Corpus(in_dir)
-    total_words = 0
-    total_sents = 0
-    for text_no, text_loc in enumerate(iter_dir(corpus.directory)):
-        with text_loc.open("r", encoding="utf-8") as file_:
-            text = file_.read()
-        total_sents += text.count("\n")
-        doc = nlp(text)
-        total_words += corpus.count_doc(doc)
-        logger.info(
-            "PROGRESS: at batch #%i, processed %i words, keeping %i word types",
-            text_no,
-            total_words,
-            len(corpus.strings),
-        )
-    model.corpus_count = total_sents
-    model.raw_vocab = defaultdict(int)
-    for orth, freq in corpus.counts:
-        if freq >= min_count:
-            model.raw_vocab[nlp.vocab.strings[orth]] = freq
-    model.scale_vocab()
-    model.finalize_vocab()
-    model.iter = nr_iter
-    model.train(corpus)
     model.save(out_loc)
 
-
 if __name__ == "__main__":
     plac.call(main)