Qwen3: allow tied embedding #39
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Qwen3 0.6B, 1.7B, and 4B use tied embeddings. This PR updates
model.pyto support tied embeddings. It also fixes a bug inchkpt_utils.py: for whatever reason, the checkpoints of some Qwen3 models that use tied embeddings store bothlm_headandmodel.embed_tokenseven though these are identical tensors (the embeddings are tied). I added a check for this, and when it happens simply delete thelm_headtensor from the checkpoint.