MoLA-LLM/MoLA-v0.5-9x4b

Important Note: This model has issues with the lora applying part of the custom lm class and its router is a bit too small with little generalization. In v0.6 and future models, all of these issues are/will be resolved.

TLDR: Dont use this model, use v0.6 and above.

MoLA-LM: Mixture of LoRA Adapters LLM

MoLA-LM combines multiple LoRA adapters with an intelligent router to automatically select the best adapter for each input prompt. This approach enables specialized performance across different tasks while maintaining efficiency.

Model Details

• Model Type: Mixture of LoRA Adapters Language Model
• Base Model: Qwen/Qwen3-4B-Thinking-2507
• Total Adapters: 9
• Architecture: Custom MoLAForCausalLM with automatic adapter routing

Usage

from transformers import AutoModelForCausalLM, AutoTokenizer

# Load the model (trust_remote_code=True is required for custom architecture)
model = AutoModelForCausalLM.from_pretrained(
    "MoLA-LLM/MoLA-v0.5-9x4b", 
    trust_remote_code=True, 
    device_map="auto"
)
tokenizer = AutoTokenizer.from_pretrained("MoLA-LLM/MoLA-v0.5-9x4b", trust_remote_code=True)

# Use like any other language model - adapter selection is automatic
prompt = "Write a Python function to calculate fibonacci numbers"
messages = [{"role": "user", "content": prompt}]
inputs = tokenizer.apply_chat_template(
    messages,
    add_generation_prompt=True,
    tokenize=True,
    return_dict=True,
    return_tensors="pt",
).to(model.device)

outputs = model.generate(**inputs, max_new_tokens=8192, temperature=.6, do_sample=True)
response = tokenizer.decode(outputs[0][inputs["input_ids"].shape[-1]:], skip_special_tokens=True)

print(f"Selected LoRA: {model.get_current_lora()}")
print(response)

You can also use load_in_4bit and load_in_8bit directly when loading!

Architecture

The MoLA-LM architecture consists of:

1. Base Model: Qwen/Qwen3-4B-Thinking-2507
2. Router Network: Frozen encoder as Sentence transformer + decoder as one layer MLP for adapter selection
3. LoRA Adapters: 9 task-specific fine-tuned adapters
4. Dynamic Switching: Automatic adapter application based on input

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Paper coming soon™