[pull] main from mlc-ai:main #296
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This PR implements the DeepSeek-V2 Model architecture: https://huggingface.co/deepseek-ai/DeepSeek-V2-Lite/blob/main/modeling_deepseek.py. The notable changes from the common LLM architecture includes: - Multihead Latent Attention (MLA) - Yarn Rotary Positional Embeddings - DeepSeekMoE Example execution on M2 ultra: ``` % mlc_llm chat ../models/DeepSeek-V2-Lite-Chat-MLC-q0f16 --model-lib ../models/DeepSeek-V2-Lite-Chat-MLC-q 0f16/model.dylib >>> who are you? I am an AI assistant created by DeepSeek to be helpful and harmless. ``` TODO: - Currently the model architecture only supports Deepseek-V2-Lite. To support Deepseek-V2, we also need to support the `group_limited_greedy` strategy. - Support tensor parallel > 1.
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This PR fixes a bug in the streamer handling for UTF-8 characters. Prior to this PR, the streamer has an assumption that a replacement character (`�`) always correspond to an entire token. However, for the Qwen2 model tokenizer, some token can be ` �` if decoded directly, which breaks the assumption and leads to incorrect result generated by the streamer. This PR fixes this issue with a safer behavior that does not rely on such an assumption.
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