Fix the num_batches value in error message

[rohitgr7]

What does this PR do?

The warning was displaying the updated num_batches.

Does your PR introduce any breaking changes? If yes, please list them.

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Part of #1

cc @Borda @justusschock @awaelchli @ninginthecloud

[github-actions]

Build Error! No Linked Issue found. Please link an issue or mention it in the body using #<issue_id>

[tchaton]

LGTM !

[tchaton]

LGTM !

[awaelchli]

great!

[carmocca]

LGTM!

@rohitgr7 there is conflicts to resolve