Added dictionary learning (DL) functionality to LSQML, cleaned up tensor operations in RPIE + DL#42

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a4894z wants to merge 9 commits intomainfrom

Commits on Jul 31, 2025

infrastructure for LSQML + sDL
Ashish Tripathi
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calculation of sparse code update direction, next step is computing
Ashish Tripathi
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Commits on Aug 5, 2025

independent optimal step length calc for LSQML sample and sparse code;
Ashish Tripathi
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Commits on Aug 6, 2025

lsqml correct step length
Ashish Tripathi
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Commits on Aug 13, 2025

added dictionary learning to the OPR mode updates, I still need to
Ashish Tripathi
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Commits on Aug 19, 2025

Work in progress reflecting some of the changes Ming requested, still
Ashish Tripathi
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style changes and more control logic tweaking
Ashish Tripathi
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Commits on Aug 27, 2025

refactor of sparse code + dictionary learning shared and OPR mode update
Ashish Tripathi
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updated a doc string
Ashish Tripathi
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