[Bugfix] Handle negative input dimension in 'cat' operator

[2niuhe]

PR Category

Operator

Type of Change

Bug Fix

Description

This commit converts negative input dimension to positive in the 'cat' operator and adds unit tests to verify this functionality.

Issue

• Resolves #248

Progress

• [ ] Change is properly reviewed (1 reviewer required, 2 recommended).
• [x] Change is responded to an issue.
• [x] Change is fully covered by a UT.

Performance