bangla-gsg

BanglaGSG

BanglaGSG is a custom hybrid language model trained from scratch on a mixed corpus of Bangla (~7.37B tokens), English (~1.23B tokens) and Dual Translation set (~1.03B tokens) totalling at ~9.62B tokens. It leverages a unique architectural blend of Grouped Query Attention (GQA), Sliding Window Attention (SWA), and Gated Delta Networks (GDN) to achieve high performance and efficient inference for the Bengali language.

Model Details

• Architecture: Hybrid (GQA + SWA + GDN)
• Language(s): Bengali (Primary), English (Secondary/Translation)
• Training Data: A curated 9.6B token mixture of web-crawled Bengali text, English monolingual data, and high-quality parallel translation pairs. All data underwent rigorous deduplication and strict NFC normalization via the custom bnunicodenormalizer pipeline.
• Parameters: ~186M

Requirements & Setup

Because this model relies on a custom architecture and requires strict linguistic normalization, you must install the normalizer and enable trust_remote_code=True when loading it.

1. Install the required normalizer and custom architecture dependencies:

pip install bnunicodenormalizer flash-linear-attention

(If this package is missing, the custom tokenizer will fallback to raw text, which may cause severe hallucinations or degraded performance since the model expects strict NFC normalization).

Usage

You can load the model seamlessly using the Hugging Face transformers library:

import torch
from transformers import AutoTokenizer, AutoModelForCausalLM

model_id = "tasmin-jahan/bangla-gsg"

# The custom tokenizer automatically applies the bnunicodenormalizer behind the scenes
tokenizer = AutoTokenizer.from_pretrained(model_id, trust_remote_code=True)

# Load the custom hybrid model
model = AutoModelForCausalLM.from_pretrained(
    model_id, 
    trust_remote_code=True, 
    torch_dtype=torch.bfloat16,
    device_map="auto"
)

prompt = "বাংলাদেশের রাজধানী"
inputs = tokenizer(prompt, return_tensors="pt").to(model.device)

outputs = model.generate(**inputs, max_new_tokens=50, temperature=0.7)
print(tokenizer.decode(outputs[0], skip_special_tokens=True))

Architecture Notes

This model does not use a standard Transformer block. Instead, it utilizes:

• GDN (Gated Delta Networks): For highly efficient, linear-time sequential processing.
• SWA (Sliding Window Attention): To maintain local context with lower memory overhead.
• GQA (Grouped Query Attention): For optimized key-value caching during generation.

Limitations

• Normalization Dependency: The model is highly sensitive to text format. Raw, un-normalized inputs will yield poor results. Always ensure bnunicodenormalizer is installed.
• Custom Code: Due to the hybrid architecture, this model requires executing custom Python scripts (modeling_banglagsg.py, configuration_banglagsg.py, tokenization_banglagsg.py) upon loading.