Added support for Multimodal eval

[anirudhs001]

PR for #1334

Used VLMEvalWrapper from torchtune to support evaluation for multimodal models (llama3.2 11b only for now)

A sample run for mmmu_val_art:

(venv) anirudhsingh@Anirudhs-MacBook-Pro-4 torchchat % python torchchat.py eval Llama-3.2-mm --device cpu --dtype bf16 --task mmmu_val_art --modality text-image --max-seq-length 2048 
NumExpr defaulting to 12 threads.
PyTorch version 2.7.0.dev20250124 available.
Looking for libcustom_ops_aot_lib.so in /Users/anirudhsingh/MISC/playground/torchchat/venv/lib/python3.10/site-packages/executorch
Loading custom ops library: /Users/anirudhsingh/MISC/playground/torchchat/venv/lib/python3.10/site-packages/executorch/extension/llm/custom_ops/libcustom_ops_aot_lib.dylib
Unable to import torchao experimental quant_api with error:  [Errno 2] No such file or directory: '/Users/anirudhsingh/MISC/playground/torchchat/torchao-build/src/ao/torchao/experimental/quant_api.py'
Modality of model=text-image
Using device=cpu
Loading model...
Time to load model: 0.25 seconds
-----------------------------------------------------------
Building contexts for mmmu_val_art on rank 0...
100%|█████████████████████████████████████████████████████████████████████████████████████████████████████████████████████████████████████████████████████████████████████████████████████████████████████████████████████████| 30/30 [00:00<00:00, 20148.78it/s]
Running generate_until requests
Running generate_until requests with text+image input: 100%|██████████████████████████████████████████████████████████████████████████████████████████████████████████████████████████████████████████████████████████████████| 30/30 [7:49:19<00:00, 938.65s/it]
Time to run eval: 28171.31s.
Time in model.forward: 28154.47s, over 30 model evaluations
forward run time stats - Median: 360.38s Min: 355.40s Max: 8932.57s
For model /Users/anirudhsingh/.torchchat/model-cache/meta-llama/Llama-3.2-11B-Vision-Instruct/model.pth
mmmu_val_art:
 alias: Art
 acc,none: 0.2333
 acc_stderr,none: 0.0785

And with a limit of 1 sample:

(venv) anirudhsingh@Anirudhs-MacBook-Pro-4 torchchat % python torchchat.py eval Llama-3.2-mm --device cpu --dtype bf16 --task mmmu_val_art --limit 1 --modality text-image --max-seq-length 720
NumExpr defaulting to 12 threads.
PyTorch version 2.7.0.dev20250124 available.
Looking for libcustom_ops_aot_lib.so in /Users/anirudhsingh/MISC/playground/torchchat/venv/lib/python3.10/site-packages/executorch
Loading custom ops library: /Users/anirudhsingh/MISC/playground/torchchat/venv/lib/python3.10/site-packages/executorch/extension/llm/custom_ops/libcustom_ops_aot_lib.dylib
Unable to import torchao experimental quant_api with error:  [Errno 2] No such file or directory: '/Users/anirudhsingh/MISC/playground/torchchat/torchao-build/src/ao/torchao/experimental/quant_api.py'
Modality of model=text-image
Using device=cpu
Loading model...
Time to load model: 0.25 seconds
-----------------------------------------------------------
Building contexts for mmmu_val_art on rank 0...
100%|████████████████████████████████████████████████████████████████████████████████████████████████████████████████████| 1/1 [00:00<00:00, 5159.05it/s]
Running generate_until requests
Running generate_until requests with text+image input: 100%|██████████████████████████████████████████████████████████████| 1/1 [08:38<00:00, 518.97s/it]
Time to run eval: 531.16s.
Time in model.forward: 518.80s, over 1 model evaluations
forward run time stats - Median: 518.80s Min: 518.80s Max: 518.80s
For model /Users/anirudhsingh/.torchchat/model-cache/meta-llama/Llama-3.2-11B-Vision-Instruct/model.pth
mmmu_val_art:
 alias: Art
 acc,none: 0.0000

[pytorch-bot]

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[anirudhs001]

Closed this since it was behind main. Rebased my branch and created #1499