Fixed #1006 RuntimeWarning divide by zero encountered in divide

[NimaSarajpoor]

See #1006

This PR addresses part1, 2, and 3 as discussed here: #1006 (comment)

[codecov]

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Project coverage is 97.42%. Comparing base (3077d0d) to head (5e056d3).
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@@ Coverage Diff @@## main #1012 +/- ##
=======================================
Coverage 97.41% 97.42% =======================================
Files 89 89 Lines 14922 14959 +37 =======================================
+ Hits 14537 14574 +37 
Misses 385 385 

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[NimaSarajpoor]

@seanlaw
I have one comment. Can you please take a look and let me know what you think?

[NimaSarajpoor]

Since Q and Ts[i] are UNPROCESSED, QT[idx] can get meaningless value for a non-finite subsequence that starts at idx. Better to just replace them with np.nan. So, for example, we can do something like this after computing QT (QT = core.sliding_dot_product(Q, Ts[i])):

# post-processing QT
if np.any(~np.isfinite(Q)):
QT[:] = np.nan
QT[~np.isfinite(M_Ts[i])] = np.nan

Note that QT[idx] will be ignored though eventually once it comes to computing its corresponding value in the distance profile via core.calculate_distance_profile (see a few lines below). In other words, we do not need the "post-processing of QT" but I think it makes code clearer.

Any concerns?

---

[Update]
Note: Since we pass inputs with non-finite values to core.calculate_distance_profile (Not only QT but also M_T), maybe I should better stop here and try to address #1011 first. Then come back and resume the work on this PR.

[seanlaw]

I understand the need to replace the ugly Ts[Ts_idx][subseq_idx : subseq_idx + m] with Q. That's fine but

QT = core.sliding_dot_product(Q, Ts[i])

doesn't seem to require any post-processing when either Q or T contain np.nan.

[NimaSarajpoor]

My bad! You are right. No need for post-processing QT

[NimaSarajpoor]

@seanlaw

maybe I should better stop here and try to address #1011 first. Then come back and resume the work on this PR.

I did an experiment and shared the result in #1011. We can either work on that and then come back here. Or, on the second thought, we can still merge this (after I resolve the merge conflicts), and then work on #1011.

What do you think?

[seanlaw]

Since we have a merge conflict here anyways, let's fix #1011 first and then come back here and strikethrough the comment:

Note: Since we pass inputs with non-finite values to core.calculate_distance_profile (Not only QT but also M_T), maybe I should better stop here and try to address #1011 first. Then come back and resume the work on this PR.

so that we are focused on this issue/PR instead of being distracted by jumping back and forth. I am getting confused by having so many things open and so it feels disorganized