text: Title: Deprecation warnings: `scipy.sparse.sparsetools` and `np.float` 
  Body: #### Problem description
  
  Run the test for the new version of [WEFE](https://github.com/raffaem/wefe)
  
  #### Steps/code/corpus to reproduce
  
  ```
  ../../../../../../home/raffaele/.virtualenvs/gensim4/lib/python3.8/site-packages/scipy/sparse/sparsetools.py:21
    /home/raffaele/.virtualenvs/gensim4/lib/python3.8/site-packages/scipy/sparse/sparsetools.py:21: DeprecationWarning: `scipy.sparse.sparsetools` is deprecated!
    scipy.sparse.sparsetools is a private module for scipy.sparse, and should not be used.
      _deprecated()
  
  ../../../../../../home/raffaele/.virtualenvs/gensim4/lib/python3.8/site-packages/sklearn/linear_model/_least_angle.py:34
    /home/raffaele/.virtualenvs/gensim4/lib/python3.8/site-packages/sklearn/linear_model/_least_angle.py:34: DeprecationWarning: `np.float` is a deprecated alias for the builtin `float`. Use `float` by itself, which is identical in behavior, to silence this warning. If you specifically wanted the numpy scalar type, use `np.float_` here.
      method='lar', copy_X=True, eps=np.finfo(np.float).eps,
  
  ../../../../../../home/raffaele/.virtualenvs/gensim4/lib/python3.8/site-packages/sklearn/linear_model/_least_angle.py:164
    /home/raffaele/.virtualenvs/gensim4/lib/python3.8/site-packages/sklearn/linear_model/_least_angle.py:164: DeprecationWarning: `np.float` is a deprecated alias for the builtin `float`. Use `float` by itself, which is identical in behavior, to silence this warning. If you specifically wanted the numpy scalar type, use `np.float_` here.
      method='lar', copy_X=True, eps=np.finfo(np.float).eps,
  
  ../../../../../../home/raffaele/.virtualenvs/gensim4/lib/python3.8/site-packages/sklearn/linear_model/_least_angle.py:281
    /home/raffaele/.virtualenvs/gensim4/lib/python3.8/site-packages/sklearn/linear_model/_least_angle.py:281: DeprecationWarning: `np.float` is a deprecated alias for the builtin `float`. Use `float` by itself, which is identical in behavior, to silence this warning. If you specifically wanted the numpy scalar type, use `np.float_` here.
      eps=np.finfo(np.float).eps, copy_Gram=True, verbose=0,
  
  ../../../../../../home/raffaele/.virtualenvs/gensim4/lib/python3.8/site-packages/sklearn/linear_model/_least_angle.py:865
    /home/raffaele/.virtualenvs/gensim4/lib/python3.8/site-packages/sklearn/linear_model/_least_angle.py:865: DeprecationWarning: `np.float` is a deprecated alias for the builtin `float`. Use `float` by itself, which is identical in behavior, to silence this warning. If you specifically wanted the numpy scalar type, use `np.float_` here.
      eps=np.finfo(np.float).eps, copy_X=True, fit_path=True,
  
  ../../../../../../home/raffaele/.virtualenvs/gensim4/lib/python3.8/site-packages/sklearn/linear_model/_least_angle.py:1121
    /home/raffaele/.virtualenvs/gensim4/lib/python3.8/site-packages/sklearn/linear_model/_least_angle.py:1121: DeprecationWarning: `np.float` is a deprecated alias for the builtin `float`. Use `float` by itself, which is identical in behavior, to silence this warning. If you specifically wanted the numpy scalar type, use `np.float_` here.
      eps=np.finfo(np.float).eps, copy_X=True, fit_path=True,
  
  ../../../../../../home/raffaele/.virtualenvs/gensim4/lib/python3.8/site-packages/sklearn/linear_model/_least_angle.py:1149
    /home/raffaele/.virtualenvs/gensim4/lib/python3.8/site-packages/sklearn/linear_model/_least_angle.py:1149: DeprecationWarning: `np.float` is a deprecated alias for the builtin `float`. Use `float` by itself, which is identical in behavior, to silence this warning. If you specifically wanted the numpy scalar type, use `np.float_` here.
      eps=np.finfo(np.float).eps, positive=False):
  
  ../../../../../../home/raffaele/.virtualenvs/gensim4/lib/python3.8/site-packages/sklearn/linear_model/_least_angle.py:1379
    /home/raffaele/.virtualenvs/gensim4/lib/python3.8/site-packages/sklearn/linear_model/_least_angle.py:1379: DeprecationWarning: `np.float` is a deprecated alias for the builtin `float`. Use `float` by itself, which is identical in behavior, to silence this warning. If you specifically wanted the numpy scalar type, use `np.float_` here.
      max_n_alphas=1000, n_jobs=None, eps=np.finfo(np.float).eps,
  
  ../../../../../../home/raffaele/.virtualenvs/gensim4/lib/python3.8/site-packages/sklearn/linear_model/_least_angle.py:1621
    /home/raffaele/.virtualenvs/gensim4/lib/python3.8/site-packages/sklearn/linear_model/_least_angle.py:1621: DeprecationWarning: `np.float` is a deprecated alias for the builtin `float`. Use `float` by itself, which is identical in behavior, to silence this warning. If you specifically wanted the numpy scalar type, use `np.float_` here.
      max_n_alphas=1000, n_jobs=None, eps=np.finfo(np.float).eps,
  
  ../../../../../../home/raffaele/.virtualenvs/gensim4/lib/python3.8/site-packages/sklearn/linear_model/_least_angle.py:1755
    /home/raffaele/.virtualenvs/gensim4/lib/python3.8/site-packages/sklearn/linear_model/_least_angle.py:1755: DeprecationWarning: `np.float` is a deprecated alias for the builtin `float`. Use `float` by itself, which is identical in behavior, to silence this warning. If you specifically wanted the numpy scalar type, use `np.float_` here.
      eps=np.finfo(np.float).eps, copy_X=True, positive=False):
  ```
  
  #### Versions
  
  Please provide the output of:
  
  ```python
  Linux-5.8.0-33-generic-x86_64-with-glibc2.32
  Python 3.8.6 (default, Sep 25 2020, 09:36:53) 
  [GCC 10.2.0]
  Bits 64
  NumPy 1.20.0rc1
  SciPy 1.6.0rc1
  gensim 4.0.0beta
  FAST_VERSION 1
  ```
  