update readme

Author: mobicham

Readme.md

@@ -17,7 +17,7 @@ This repository contains the official implementation of Half-Quadratic Quantizat
 <li> HQQ is compatible with peft training.</li>
 <li> We try to make HQQ fully compatible `torch.compile` for faster inference and training.</li>
 </ul>
-	
+  
   <b>What is the quality of the quantized models? </b><br>
   We have detailed benchmarks on both language and vision models. Please refer to our blog posts: <a href="https://mobiusml.github.io/hqq_blog/">HQQ</a>, <a href="https://mobiusml.github.io/1bit_blog/">HQQ+</a>.<br> 
 
@@ -26,10 +26,10 @@ This repository contains the official implementation of Half-Quadratic Quantizat
 
   <b>What quantization settings should I use?</b><br>
   You should start with `nbits=4, group_size=64, axis=1`. These settings offer a good balance between quality, vram usage and speed. If you want better results with the same vram usage, switch to `axis=0` and use the ATEN backend. If you want to use lower like `nbits=2`, you should use `axis=0`with a low group-size via HQQ+, meaning adding low-rank adapters and fine-tune with a small dataset. <br>
-	
+  
   <b>What does the `axis` parameter mean? </b><br>
   The `axis` parameter is the axis along which grouping is performed. In general `axis=0` gives better results than `axis=1`, especially at lower bits. However, the optimized inference runtime only supports `axis=1` for the moment.<br>
-	
+  
   <b>What is the difference between HQQ and HQQ+?</b><br>
   HQQ+ is HQQ with trainable low-rank adapters to improve the quantization quality at lower bits.<br>
 
@@ -65,9 +65,6 @@ The quantization parameters are set as follows:
 
 - ```nbits``` (int): supports 8, 4, 3, 2, 1 bits.
 - ```group_size``` (int): no restrictions as long as ```weight.numel()``` is divisible by the ```group_size```.
-- ```quant_zero``` (bool): if True, it quantizes the zero-point to 8-bit without grouping.
-- ```quant_scale``` (bool): if True, it quantizes the scaling factor to 8-bit with a group_size of 128.
-- ```offload_meta``` (bool): if True, meta-data is offloaded to the CPU.
 - ```view_as_float``` (bool): if True, the quantized parameter is viewed as float instead of a int type.
 
 Setting ```offload_meta=True``` drastically decreases the GPU memory requirements but makes processing slower for smaller group-sizes. When turned on, you can run Llama2-70B and Mixtral with HQQ 2-bit using only 18.8GB and 13GB VRAM respectively.
@@ -76,9 +73,9 @@ Setting ```offload_meta=True``` drastically decreases the GPU memory requirement
 #### Native Backends
 The following native backends can be used by the `HQQLinear` module:
 ```Python
-HQQLinear.set_backend(HQQBackend.PYTORCH)          #Pytorch backend
+HQQLinear.set_backend(HQQBackend.PYTORCH)          #Pytorch backend - Default
 HQQLinear.set_backend(HQQBackend.PYTORCH_COMPILE)  #Compiled Pytorch
-HQQLinear.set_backend(HQQBackend.ATEN)             #Aten/CUDA backend
+HQQLinear.set_backend(HQQBackend.ATEN)             #Aten/CUDA backend - only axis=0 supported
 ```
 The ```HQQBackend.ATEN``` backend is automatically installed and used by default when available.
 Note that ```HQQBackend.ATEN```  only supports `axis=0`. For `axis=1` you need to use ```HQQBackend.PYTORCH``` or ```HQQBackend.PYTORCH_COMPILE```.
@@ -88,7 +85,7 @@ Below you can find the speed-up benchmark with various backends, ```HQQBackend.P
  <div class="row"><center>
   <div class="column">
     <img src="https://github.com/mobiusml/hqq/blob/master/imgs/hqq_cuda_dequant_llama27b_titanrtx.png" alt="Titan RTX" style="width:48%">
-	<img src="https://github.com/mobiusml/hqq/blob/master/imgs/hqq_cuda_dequant_llama270b_a100.png" alt="A100" style="width:48%">
+  <img src="https://github.com/mobiusml/hqq/blob/master/imgs/hqq_cuda_dequant_llama270b_a100.png" alt="A100" style="width:48%">
   </div>
  </center>
 </div> 
@@ -124,7 +121,7 @@ For usage with HF's transformers, see the example below from the <a href="https:
 from transformers import AutoModelForCausalLM, HqqConfig
 
 # All linear layers will use the same quantization config
-quant_config = HqqConfig(nbits=4, group_size=64, quant_zero=False, quant_scale=False, axis=1)
+quant_config = HqqConfig(nbits=4, group_size=64)
 
 # Load and quantize
 model = AutoModelForCausalLM.from_pretrained(
@@ -145,7 +142,7 @@ model = AutoModelForCausalLM.from_pretrained(model_id, torch_dtype=compute_dtype
 
 #Quantize
 from hqq.models.hf.base import AutoHQQHFModel
-quant_config = BaseQuantizeConfig(nbits=4, group_size=64, quant_scale=False, quant_zero=False, axis=1) 
+quant_config = BaseQuantizeConfig(nbits=4, group_size=64) 
 AutoHQQHFModel.quantize_model(model, quant_config=quant_config, compute_dtype=compute_dtype, device=device)
 ```
 #### Save/Load
@@ -160,7 +157,7 @@ AutoHQQHFModel.save_quantized(model, save_dir)
 model = AutoHQQHFModel.from_quantized(save_dir)
 ```
 #### Setting a backend
-You can set a native backned as follows:
+You can set a native backend as follows:
 ```Python
 HQQLinear.set_backend(HQQBackend.ATEN if axis==0 else HQQBackend.PYTORCH_COMPILE)
 ```
@@ -185,8 +182,8 @@ You can set up various quantization configurations for different layers by speci
 #### Transformers 🤗
 ```Python
 # Each linear layer with the same tag will use a dedicated quantization config
-q4_config = {'nbits':4, 'group_size':64, 'quant_zero':False, 'quant_scale':False}
-q3_config = {'nbits':3, 'group_size':32, 'quant_zero':False, 'quant_scale':False}
+q4_config = {'nbits':4, 'group_size':64}
+q3_config = {'nbits':3, 'group_size':32}
 
 quant_config  = HqqConfig(dynamic_config={
   'self_attn.q_proj':q4_config,
@@ -202,8 +199,8 @@ quant_config  = HqqConfig(dynamic_config={
 #### HQQ lib
 ```Python
 from hqq.core.quantize import *
-q4_config    = BaseQuantizeConfig(nbits=4, group_size=64, quant_zero=False, quant_scale=False) 
-q3_config    = BaseQuantizeConfig(nbits=3, group_size=32, quant_zero=False, quant_scale=False)
+q4_config    = BaseQuantizeConfig(nbits=4, group_size=64) 
+q3_config    = BaseQuantizeConfig(nbits=3, group_size=32)
 
 quant_config = {'self_attn.q_proj':q4_config,
   'self_attn.k_proj':q4_config,