Add Intern-S2-Mobius (interns2_mobius) model

[nightscape]

Requirements

• ☑️ I understand it is strictly prohibited to use AI to write PR description
• AI usage disclosure: AI was used to port the model from https://github.com/InternLM/Intern-S2-Mobius

Model information

• Name: Intern-S2-Mobius
• Homepage: https://huggingface.co/internlm/Intern-S2-Mobius
• Reference implementation: https://github.com/InternLM/Intern-S2-Mobius

Supported checkpoints

• https://huggingface.co/internlm/Intern-S2-Mobius (bf16, 35B — upstream)
• Local 4-bit group-64 conversion (19.6 GB, ~4.5 bpw): https://huggingface.co/nightscape/Intern-S2-Mobius-4bit-mlx

Verification

Run mlx-lm command:

mlx_lm.generate --model nightscape/Intern-S2-Mobius-4bit-mlx -p "The secret to baking a good cake is" -m 1024 --trust-remote-code

--trust-remote-code is required for the custom tokenization_interns1.py tokenizer.
Output (from the 4-bit conversion; upstream bf16 would use the same code path):

Thinking Process:

1.  **Analyze the Request:** The user is asking for the "secret to baking a good cake." This is a common question, often expecting a humorous or clichéd answer, but also potentially looking for practical advice. However, the phrasing "The secret to baking a good cake is" sounds like the setup for a joke or a well-known saying.

2.  **Identify Potential Answers:**
    *   *Practical advice:* Good ingredients, accurate measurements, proper mixing, correct temperature.
    *   *Humorous/Clichéd answer:* "Love," "Patience," "Don't open the door too soon."
    *   *Classic joke:* "The secret to baking a good cake is to bake a good cake." (Tautology)
    *   *Another common saying:* "The secret is in the ingredients."

3.  **Determine the Best Fit:** Since the prompt is incomplete ("The secret to baking a good cake is"), it invites completion. The most famous and universally accepted "secret" in baking lore is often attributed to Julia Child or general culinary wisdom: **"to bake a good cake."** It's a tautological joke often used to emphasize that technique and process matter more than hidden tricks. Alternatively, it could be looking for practical tips. However, given the phrasing, the classic joke answer is the most likely intended completion, though providing practical value is also good.

4.  **Formulate the Output:** I should complete the sentence with the classic answer but perhaps acknowledge the practical side too. Actually, the classic joke is the most direct completion. Let's stick with the classic witty response.

Answer: "to bake a good cake."

Wait, let's consider if there's a more helpful answer. If someone asks this, they might want tips. But the phrasing "The secret to baking a good cake is" strongly implies the completion of the famous quote. I will provide the classic completion.

Refined thought: The most common completion is "to bake a good cake." It's a self-referential joke. I'll provide that.cw
</think>

to bake a good cake.
==========
Prompt: 18 tokens, 83.234 tokens-per-sec
Generation: 453 tokens, 38.072 tokens-per-sec
Peak memory: 19.625 GB

(measured on a MacBook Max M4 128GB RAM)

[zcbenz]

Can you please use the new pull request template:
https://github.com/ml-explore/mlx-lm/blob/main/.github/PULL_REQUEST_TEMPLATE/new_model.md

[zcbenz]

@nightscape You did not fill the template.