text: Title: doc2vec's infer_vector has `epochs` and `steps` input parameters - `steps` not in use
  Body: Refer to doc2vec.py, `infer_vector` function seems to be using `epochs` for the number of iterations and `steps` is not in used.
  
  However, in the `similarity_unseen_docs` function, `steps` is used when calling the infer_vector function.
  
  ![image](https://user-images.githubusercontent.com/62754326/119926239-9085d400-bfa9-11eb-838b-dae98da26c3f.png)
  