[FIX] - Fix for summarization edge case

[sky-2002]

This PR adds a fix for the issue mentioned in #1108

However I have a points to discuss @shahules786 :

• I had added conciseness_score to penalize long summaries, but I also do not want to promote very very short and skimpy summaries, need to find a middle ground.
• Is averaging a good way to combine QA_score and conciseness_score?
• Ranking based metrics to measure quality of summarization (as mentioned by shahul in the above issue)

Given the conclusions we reach based on these discussion points, I will push more commits, let's keep this PR open till we resolve these points.

[shahules786]

Hey @sky-2002 thanks for the PR, my friend. I have answered your query in the here
I think doing that will resolve the issue. Let me know your thoughts

When you make the change please make sure you modify and explain the same in docs too

[shahules786]

LGTM

[shahules786]

@sky-2002 Sorry for the late merge. There were few important changes I had to make on this, please take a look at it so you know.

[shahules786]

Hey @jjmachan Can you check what's with the lining errors on those files (not modified in this PR)