miRNA functionality with elevated number of samples

[JFsanchezherrero]

@MartaLoBalastegui noticed that

The miRNA final output matrix, which contains the counts for each isomir/miRNA (rows) and sample (cols), seems to be incompleted when working with an elevated number of samples. A possible explanation is the existence of a global variable 'results_df'. This variable is edited in parallel by the different threads, as a consequence, it may not be correctly built.

She created a project with the description of the issue.

For restructuring the information, I have just created this issue and set it to be within the project "New improvements", designed for general purposes.

We are working on it and problem might be already solved with commit 5708dd9. We just need some additional debugging and test.

[JFsanchezherrero]

Fix for miRNA module but missing implementation in tRNA module! To take into account!