Change learn_param to dynamic allocation (AEGHB-1335)

[KingingWang]

Allocate memory for learn_param dynamically and check for allocation failure.

Description

Related

• Fixes #123 - https://docs.github.com/en/free-pro-team@latest/github/managing-your-work-on-github/linking-a-pull-request-to-an-issue-using-a-keyword

Testing

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