Instructions to use Raghav-Singhal/pathlang-1p7b-runE-en30-zh70 with libraries, inference providers, notebooks, and local apps. Follow these links to get started.

Libraries

How to use Raghav-Singhal/pathlang-1p7b-runE-en30-zh70 with Transformers:

# Use a pipeline as a high-level helper
from transformers import pipeline

pipe = pipeline("text-generation", model="Raghav-Singhal/pathlang-1p7b-runE-en30-zh70")
messages = [
    {"role": "user", "content": "Who are you?"},
]
pipe(messages)

# Load model directly
from transformers import AutoTokenizer, AutoModelForCausalLM

tokenizer = AutoTokenizer.from_pretrained("Raghav-Singhal/pathlang-1p7b-runE-en30-zh70")
model = AutoModelForCausalLM.from_pretrained("Raghav-Singhal/pathlang-1p7b-runE-en30-zh70", device_map="auto")
messages = [
    {"role": "user", "content": "Who are you?"},
]
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=40)
print(tokenizer.decode(outputs[0][inputs["input_ids"].shape[-1]:]))

Notebooks
Google Colab
Kaggle
Local Apps Settings

vLLM

How to use Raghav-Singhal/pathlang-1p7b-runE-en30-zh70 with vLLM:

Install from pip and serve model

# Install vLLM from pip:
pip install vllm
# Start the vLLM server:
vllm serve "Raghav-Singhal/pathlang-1p7b-runE-en30-zh70"
# Call the server using curl (OpenAI-compatible API):
curl -X POST "http://localhost:8000/v1/chat/completions" \
	-H "Content-Type: application/json" \
	--data '{
		"model": "Raghav-Singhal/pathlang-1p7b-runE-en30-zh70",
		"messages": [
			{
				"role": "user",
				"content": "What is the capital of France?"
			}
		]
	}'

Use Docker

docker model run hf.co/Raghav-Singhal/pathlang-1p7b-runE-en30-zh70

SGLang

How to use Raghav-Singhal/pathlang-1p7b-runE-en30-zh70 with SGLang:

Install from pip and serve model

# Install SGLang from pip:
pip install sglang
# Start the SGLang server:
python3 -m sglang.launch_server \
    --model-path "Raghav-Singhal/pathlang-1p7b-runE-en30-zh70" \
    --host 0.0.0.0 \
    --port 30000
# Call the server using curl (OpenAI-compatible API):
curl -X POST "http://localhost:30000/v1/chat/completions" \
	-H "Content-Type: application/json" \
	--data '{
		"model": "Raghav-Singhal/pathlang-1p7b-runE-en30-zh70",
		"messages": [
			{
				"role": "user",
				"content": "What is the capital of France?"
			}
		]
	}'

Use Docker images

docker run --gpus all \
    --shm-size 32g \
    -p 30000:30000 \
    -v ~/.cache/huggingface:/root/.cache/huggingface \
    --env "HF_TOKEN=<secret>" \
    --ipc=host \
    lmsysorg/sglang:latest \
    python3 -m sglang.launch_server \
        --model-path "Raghav-Singhal/pathlang-1p7b-runE-en30-zh70" \
        --host 0.0.0.0 \
        --port 30000
# Call the server using curl (OpenAI-compatible API):
curl -X POST "http://localhost:30000/v1/chat/completions" \
	-H "Content-Type: application/json" \
	--data '{
		"model": "Raghav-Singhal/pathlang-1p7b-runE-en30-zh70",
		"messages": [
			{
				"role": "user",
				"content": "What is the capital of France?"
			}
		]
	}'

Docker Model Runner
How to use Raghav-Singhal/pathlang-1p7b-runE-en30-zh70 with Docker Model Runner:
```
docker model run hf.co/Raghav-Singhal/pathlang-1p7b-runE-en30-zh70
```

pathlang-1p7b-runE-en30-zh70

A 1.7B-parameter bilingual (English + Chinese) language model trained with a purely sequential monolingual curriculum: all of one language, then all of the other. This is the English-first sequential (en30->zh70) run, part of a controlled language-ordering study. Companion blended-curriculum runs (50/50 diet, 3-phase) live at Raghav-Singhal/pathlang-1p7b-runA-zh-first, -runB-en-first, -runC-5050.

Curriculum (this run)

Phase 1 (0-30B): 100% English
Phase 2 (30-100B): 100% Chinese

The mirror run is Raghav-Singhal/pathlang-1p7b-runD-zh30-en70.

Architecture

SmolLM2-1.7B backbone: 24 layers, hidden 2048, FFN 8192, 32 heads, RoPE (base 10000), RMSNorm, SwiGLU, seq len 2048
Tokenizer: Qwen3 (multilingual, vocab 151,936); ~2.1B total params
Converted from Megatron-LM to HF LlamaForCausalLM

Training

100B tokens total, global batch size 960, 50,860 steps
WSD LR schedule (peak 2e-4, 2000 warmup, linear decay over the final 10B tokens), bf16, Adam
English: DCLM-edu. Chinese: FineWeb-2 hq-mmbert quality_33 (cmn_Hani) — a larger slice than the quality_10 used by the A/B/C runs, needed for the 70B Chinese phase.

Held-out validation loss (final checkpoint, 100B tokens)

	English val	Chinese val
this run (English-first sequential (en30->zh70))	3.997	2.531

In-loop 128-seq probe, cross-entropy nats/token, on this study's held-out blocks (comparable within the D/E pair). Key finding — catastrophic forgetting under sequential training: the model ends excellent at its second (70B) language and substantially degraded at the first, abandoned one. E.g. this run's first-phase language rose from ~2.7 loss at the 30B switch to the value above by 100B — much sharper forgetting than the blended A/B runs, which retained 25% of the earlier language throughout.

Usage

from transformers import AutoModelForCausalLM, AutoTokenizer
m = AutoModelForCausalLM.from_pretrained("Raghav-Singhal/pathlang-1p7b-runE-en30-zh70")
tok = AutoTokenizer.from_pretrained("Raghav-Singhal/pathlang-1p7b-runE-en30-zh70")

Note

License other pending confirmation; DCLM-edu and FineWeb-2 terms apply. Base (non-instruction-tuned) research checkpoint.

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Safetensors

Model size

2B params

Tensor type

BF16