[nvbugs-5318143] fix: restrict PyTorch memory usage to avoid OOMs

[ixlmar]

nvbugs-5318143 fix: restrict PyTorch memory usage to avoid OOMs

Description

Please explain the issue and the solution in short.

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[ixlmar]

/bot run --stage-list "DGX_H100-4_GPUs-PyTorch-Others-1"

[ixlmar]

/bot run --stage-list "DGX_H100-4_GPUs-PyTorch-Others-1"

[tensorrt-cicd]

PR_Github #11651 [ run ] triggered by Bot

[tensorrt-cicd]

PR_Github #11651 [ run ] completed with state SUCCESS
/LLM/release-0.21/L0_MergeRequest_PR pipeline #229 (Partly Tested) completed with status: 'SUCCESS'

[ixlmar]

/bot run

[tensorrt-cicd]

PR_Github #11676 [ run ] triggered by Bot

[tensorrt-cicd]

PR_Github #11676 [ run ] completed with state SUCCESS
/LLM/release-0.21/L0_MergeRequest_PR pipeline #234 completed with status: 'SUCCESS'
Pipeline passed with automatic retried tests. Check the rerun report for details.

[juney-nvidia]

This bug has been pushed to 1.0, so pls target this PR to land to the main branch directly rather than 0.21.

[ixlmar]

/bot run

[tensorrt-cicd]

PR_Github #11790 [ run ] triggered by Bot

[tensorrt-cicd]

PR_Github #11790 [ run ] completed with state SUCCESS
/LLM/main/L0_MergeRequest_PR pipeline #8735 completed with status: 'SUCCESS'
Pipeline passed with automatic retried tests. Check the rerun report for details.