Fix a bug when upgrading phraser from gensim 3.x to 4.0 (#3174)

* Fix a bug when upgrading phraser from gensim 3.x to 4.0

* Update CHANGELOG.md

Co-authored-by: Michael Penkov <m@penkov.dev>

CHANGELOG.md

@@ -7,6 +7,7 @@ Changes
 
 * [#3116](https://github.com/RaRe-Technologies/gensim/pull/3116): Fix bug where saved Phrases model did not load its connector_words, by [@aloknayak29](https://github.com/aloknayak29)
 * [#3136](https://github.com/RaRe-Technologies/gensim/pull/3136): fix indexing error in word2vec_inner.pyx, by [@bluekura](https://github.com/bluekura)
+* [#3174](https://github.com/RaRe-Technologies/gensim/pull/3174): Fix a bug when upgrading phraser from gensim 3.x to 4.0, by [@emgucv](https://github.com/emgucv)
 
 ### :+1: Improvements
 

gensim/models/phrases.py

@@ -364,7 +364,7 @@ def load(cls, *args, **kwargs):
                 }
             elif isinstance(component, tuple):  # 3.8 => 4.0: phrasegram keys are strings, not tuples with bytestrings
                 model.phrasegrams = {
-                    str(model.delimiter.join(component), encoding='utf8'): score
+                    str(model.delimiter.join(key), encoding='utf8'): val
                     for key, val in phrasegrams.items()
                 }
         except StopIteration: