fix assert pad >= 0 failed when inter_size is not a multiple of group…

[Vinkle-hzt]

Motivation

fix #2739

Modification

change little in groups_per_rank calculation to make sure the inter_size_padded is greater than the inter_size

BC-breaking (Optional)

None

Use cases (Optional)

None

[lzhangzz]

LGTM

[lvhan028]

Pls resolve linting issues:

pip install pre-commit
cd lmdeploy  # the root dir of lmdeploy repo
pre-commit install
pre-commit run --all-files

[Vinkle-hzt]

Pls resolve linting issues:

pip install pre-commit
cd lmdeploy  # the root dir of lmdeploy repo
pre-commit install
pre-commit run --all-files

fix lint error now