## OpenVINO Weight-Quantized LLMs

This repo contains binary of weight quantized by [OpenVINO](https://github.com/openvinotoolkit/openvino_notebooks/blob/main/notebooks/254-llm-chatbot/254-llm-chatbot.ipynb).

```
| LLM             	| ratio 	| group_size 	|
|-----------------	|-------	|------------	|
| llama-2-chat-7b 	| 0.8   	| 128        	|
| mistral-7b      	| 0.6   	| 64         	|
| gemma-2b-it     	| 0.6   	| 64         	|
```

Notes:
* ratio=0.8 means 80% of FC (linear) layers are 4-bit weight quantized and the rest in 8-bit.
* group_size refers to number of elements being considered to be quantized. e.g. group size of 128 means each output channel of the weight is split into groups of 128 for quantization.
* q_weight is in uint8 even it is 4-bit.
* scripts are for internal use only.

### Example usage of the saved blob
```python
import torch

blob_path = "./mistral-7b_r0.6_g64.pth"

blob = torch.load(blob_path)

for layer, attr in blob.items():
    print(f"{layer:30} | q_dtype: {attr['q_dtype']:5} | orig. shape: {str(attr['original_shape']):15} | quantized_shape: {str(attr['q_weight'].shape):15}")
```

```
# Sample outputs:
.
.
layers.14.mlp.gate_proj        | q_dtype: u4    | orig. shape: (11008, 4096)   | quantized_shape: (11008, 32, 128)
layers.14.mlp.down_proj        | q_dtype: u4    | orig. shape: (4096, 11008)   | quantized_shape: (4096, 86, 128)
layers.15.self_attn.k_proj     | q_dtype: u8    | orig. shape: (4096, 4096)    | quantized_shape: (4096, 4096)   
layers.15.self_attn.v_proj     | q_dtype: u8    | orig. shape: (4096, 4096)    | quantized_shape: (4096, 4096)   
layers.15.self_attn.q_proj     | q_dtype: u4    | orig. shape: (4096, 4096)    | quantized_shape: (4096, 32, 128)
layers.15.self_attn.o_proj     | q_dtype: u4    | orig. shape: (4096, 4096)    | quantized_shape: (4096, 32, 128)
layers.15.mlp.up_proj          | q_dtype: u4    | orig. shape: (11008, 4096)   | quantized_shape: (11008, 32, 128)
layers.15.mlp.gate_proj        | q_dtype: u4    | orig. shape: (11008, 4096)   | quantized_shape: (11008, 32, 128)
layers.15.mlp.down_proj        | q_dtype: u4    | orig. shape: (4096, 11008)   | quantized_shape: (4096, 86, 128)
layers.16.self_attn.k_proj     | q_dtype: u8    | orig. shape: (4096, 4096)    | quantized_shape: (4096, 4096)   
layers.16.self_attn.v_proj     | q_dtype: u8    | orig. shape: (4096, 4096)    | quantized_shape: (4096, 4096)   
.
.
```