Unable to load KeyedVectors models created with gensim==3.2.0: AttributeError: Can't get attribute 'EuclideanKeyedVectors'

[pypt]

Description

Hi there,

I can't seem to be able to load trimmed KeyedVectors models created with gensim 3.2.0 with any newer version of gensim (3.3.0 - 3.6.0) because:

AttributeError: Can't get attribute 'EuclideanKeyedVectors' on <module 'gensim.models.keyedvectors' from '/usr/local/lib/python3.7/site-packages/gensim/models/keyedvectors.py'>

Steps/Code/Corpus to Reproduce

To replicate:

1. Create a model with gensim==3.2.0, convert it to KeyedVectors and then save it:

pip3.7 install -qU gensim==3.2.0

from gensim.models import Word2Vec
from gensim.test.utils import common_texts

model = Word2Vec(common_texts, size=100, window=5, min_count=1, workers=4)
trimmed_model = model.wv
trimmed_model.save('test.word2vec')

2. Try loading the model with gensim>=3.2.0:

pip3.7 install -qU gensim==3.6.0	# same with 3.3.0, 3.4.0 and 3.5.0 too

from gensim.models import KeyedVectors

word_vectors = KeyedVectors.load('test.word2vec')

Expected Results

Model should get loaded and be functional.

Actual Results

KeyedVectors.load() fails with:

Traceback (most recent call last):
  File "<stdin>", line 1, in <module>
  File "/usr/local/lib/python3.7/site-packages/gensim/models/keyedvectors.py", line 212, in load
    return super(BaseKeyedVectors, cls).load(fname_or_handle, **kwargs)
  File "/usr/local/lib/python3.7/site-packages/gensim/utils.py", line 422, in load
    obj = unpickle(fname)
  File "/usr/local/lib/python3.7/site-packages/gensim/utils.py", line 1361, in unpickle
    return _pickle.load(f, encoding='latin1')
AttributeError: Can't get attribute 'EuclideanKeyedVectors' on <module 'gensim.models.keyedvectors' from '/usr/local/lib/python3.7/site-packages/gensim/models/keyedvectors.py'>

Versions

>>> import platform; print(platform.platform())
Darwin-18.0.0-x86_64-i386-64bit
>>> import sys; print("Python", sys.version)
Python 3.7.0 (default, Sep 18 2018, 18:47:08) 
[Clang 10.0.0 (clang-1000.10.43.1)]
>>> import numpy; print("NumPy", numpy.__version__)
NumPy 1.15.2
>>> import scipy; print("SciPy", scipy.__version__)
SciPy 1.1.0
>>> import gensim; print("gensim", gensim.__version__)
gensim 3.6.0
>>> from gensim.models import word2vec;print("FAST_VERSION", word2vec.FAST_VERSION)
FAST_VERSION 0

[menshikh-iv]

@pypt thanks for the report: reproduced (python2, gensim 3.2.0 + 3.6.0), looks like this can be related to #1777 again, argh @manneshiva.

[mpenkov]

Still reproducible with 3.7.2.