Fix: Molmo Crash - AttributeError: 'NoneType' object has no attribute 'size'

[DrishtiShrrrma]

Refs DrishtiShrrrma#3

Summary

• This PR updates the Transformers Version Recommendation so that Molmo-series models don’t default to “latest” or some other incompatible version. We pin to tested, working versions. This prevents a reproducible crash.

What changed

• Add the bullet that suggests compatible transformers version for Molmo-series models as **“transformers==latest didn't work for Molmo-series model (molmo-7B-D-0924).
• **Use transformers==4.46.1 or 4.50.3 or 4.51 or 4.53 ** for Molmo series (e.g., allenai/Molmo-7B-D-0924).

Tests

!python run.py --data CountBenchQA --model molmo-7B-D-0924 --verbose
!python run.py --data MMBench_DEV_EN MME SEEDBench_IMG --model molmo-7B-D-0924 --verbose

Observations (tested)

transformers	Result	Error / Notes
4.50.3	✅ Works	Stable across tested benchmarks
4.46.1	✅ Works	Stable across tested benchmarks
4.51	✅ Works	Stable across tested benchmarks
4.53	✅ Works	Stable across tested benchmarks
5.0.0.dev0	❌ Fails	AttributeError: 'NoneType' object has no attribute 'size'

Benchmarks tested

CountBenchQA, MMBench_DEV_EN, MME, SEEDBench_IMG

Model tested

allenai/Molmo-7B-D-0924 (key: molmo-7B-D-0924 )

Checklist

• ✅ Code compiles
• ✅ Local smoke tests pass