Mismatch in Model Checkpoint URL for config['lmm_ckpt']

[lds217]

The current prepare_mm_representations.py script sets the checkpoint path for config['lmm_ckpt'] as 'sparklexfantasy/llava-1.5-7b-rfrd'. However, the correct model checkpoint URL on Hugging Face is 'sparklexfantasy/llava-7b-1.5-rfrd'.