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MiniCPM-o-2_6

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Summary

This PR proposes a change in _convert to handle cases where truncation (max_inp_length)
could leave an unmatched <im_start> (or <slice_start>) token without its closing <im_end> / <slice_end>.

When this happens, image_start_idx and image_end_idx have different lengths,
causing a runtime error in line 274:

RuntimeError: Sizes of tensors must match except in dimension 1. Expected size x but got size x-1 for tensor number 1 in the list.

Changes

• Changed valid_image_nums from max(len(start), len(end)) to min(len(start), len(end))
  → only keep valid start–end pairs