Usage

python

from transformers import AutoTokenizer, AutoModelForCausalLM

model_name = 'mllmTeam/PhoneLM-1.5B-Instruct'
question = "Hello, who are you?"
prompt = [{"role": "user", "content": question}]

model = AutoModelForCausalLM.from_pretrained(model_name, device_map='cuda', trust_remote_code=True)

tokenizer = AutoTokenizer.from_pretrained(model_name)
input_text = tokenizer.apply_chat_template(prompt, tokenize=False, add_generation_prompt=True)

inp = tokenizer(input_text, return_tensors="pt")
inp = {k: v.to('cuda') for k, v in inp.items()}
out = model.generate(**inp, 
                     max_length=256,
                     do_sample=True,
                     temperature=0.7,
                     top_p=0.7
                     )
text = tokenizer.decode(out[0], skip_special_tokens=True)
print(text)

Model Details

Developed by: mllmTeam
Model type: PhoneLM 1.5B models are auto-regressive language models based on the transformer decoder architecture.
Language(s): English
Paper: PhoneLM Technical Report
Library: PhoneLM

Model Architecture

The model is a decoder-only transformer architecture with the following modifications:

Hidden Size	Layers	Heads	Sequence Length
2560	19	16	2048

Position Embeddings: Rotary Position Embeddings (Su et al., 2021) applied to the first 25% of head embedding dimensions for improved throughput following Black et al. (2022). PhoneLM quantized the sin and cos values in Rotary Position Embeddings to 8-bit integers.
Normalization: LayerNorm (Ba et al., 2016) with learned bias terms as opposed to RMSNorm (Zhang & Sennrich, 2019).
Biases: We remove all bias terms from the feed-forward networks and multi-head self-attention layers, except for the biases of the query, key, and value projections (Bai et al., 2023).
ReLU Activation Function: ReLU(Glorot et al., 2011) activation functions are adopted in feed-forward networks.
Tokenizer: We use the SmolLM(Allal et al., 2024)'s tokenizer with a vocabulary size of 49,152.

License

This repository is released under the Apache-2.0 License.

Citation

@misc{yi2024phonelmanefficientcapablesmall,
      title={PhoneLM:an Efficient and Capable Small Language Model Family through Principled Pre-training}, 
      author={Rongjie Yi and Xiang Li and Weikai Xie and Zhenyan Lu and Chenghua Wang and Ao Zhou and Shangguang Wang and Xiwen Zhang and Mengwei Xu},
      year={2024},
      eprint={2411.05046},
      archivePrefix={arXiv},
      primaryClass={cs.CL},
      url={https://arxiv.org/abs/2411.05046}, 
}