remove unused dependency, handle ImportError (#3447)

gensim/models/flsamodel.py

@@ -5,15 +5,17 @@
 @author: 20200016
 """
 
-import math
 from collections import Counter
-import warnings
-import pickle
 import itertools
+import math
+import pickle
+import sys
+import warnings
+
 import numpy as np
 from scipy.sparse.linalg import svds
 from scipy.sparse import dok_matrix
-from pyfume import Clustering
+
 import gensim.corpora as corpora
 from gensim.models.coherencemodel import CoherenceModel
 from gensim.models import Word2Vec
@@ -699,6 +701,19 @@ def _create_partition_matrix(
         -------
             numpy.array : float
         """
+
+        try:
+            from pyfume import Clustering
+        except ImportError:
+            msg = (
+                "FlsaModel requires pyfume; install manually via "
+                "`pip install pyfume` or otherwise"
+            )
+            print('-' * len(msg), file=sys.stderr)
+            print(msg, file=sys.stderr)
+            print('-' * len(msg), file=sys.stderr)
+            raise
+
         clusterer = Clustering.Clusterer(
             nr_clus=number_of_clusters,
             data=data,

setup.py

@@ -344,7 +344,6 @@ def run(self):
     NUMPY_STR,
     'scipy >= 1.7.0',
     'smart_open >= 1.8.1',
-    'FuzzyTM >= 0.4.0'
 ]
 
 setup_requires = [NUMPY_STR]