Typos, text and code fix in LDA tutorial

[davebulaval]

This PR fixes the following in all three files format:

• unused import (os.path and io)
• Fix some dead code
• Propose some text improvements

Moreover, the following link is broken http://rare-technologies.com/lda-training-tips/, and I was not able to find the new URL.

[piskvorky]

Is this a part of some assignment?

[davebulaval]

Is this a part of some assignment?

@piskvorky, no, I was just reading the tutorial and found some errors. Just a free contribution.

[davebulaval]

@piskvorky
Also, after trying different things, reading many Gensim tutorials trying to find the keywords (because I do not know all the doc elements of Gensim nor have time to do it or use logger in my ML routines), I cannot find the response to that sentence:

First, enable logging (as described in many Gensim tutorials), and set eval_every = 1 in LdaModel

I've tried Googling it using the doc search bar (that is a never-ending search BTW) and could not find a working example in less time than it would require to just describe the complete solution in the tutorial.
(Sorry if my text sound a little bit harsh, I'm just pissed to have lost 10 minutes trying to add something so simple)

So I propose to simply add the proper way to set the logger (logger.setLevel(logging.DEBUG)).

[piskvorky]

Yeah, that phrase as described in many Gensim tutorials in unnecessarily cryptic.

Can you include this code in its place instead?

logging.basicConfig(level=logging.INFO, format='PID:%(process)d:%(threadName)s - %(asctime)s - %(levelname)s - %(filename)s:%(lineno)s - %(message)s')

Thanks!

[davebulaval]

Yeah, that phrase as described in many Gensim tutorials in unnecessarily cryptic.

Can you include this code in its place instead?

logging.basicConfig(level=logging.INFO, format='PID:%(process)d:%(threadName)s - %(asctime)s - %(levelname)s - %(filename)s:%(lineno)s - %(message)s')

Thanks!

Fixed in 00b54dc

[piskvorky]

LGTM, thanks! The failing wheels seem unrelated, @mpenkov is working on those.

[davebulaval]

@piskvorky glad to help!

[codecov]

Codecov Report

Merging #3289 (f3e1671) into develop (a936521) will increase coverage by 0.00%.
The diff coverage is n/a.

@@           Coverage Diff            @@
##           develop    #3289   +/-   ##
========================================
  Coverage    79.53%   79.53%           
========================================
  Files           68       68           
  Lines        11781    11783    +2     
========================================
+ Hits          9370     9372    +2     
  Misses        2411     2411           

Impacted Files	Coverage Δ
gensim/models/keyedvectors.py	82.68% <0.00%> (+0.04%)	⬆️

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[mpenkov]

Merged, thanks @davebulaval !