code: def ext_make_q4(qweight, qzeros, scales, g_idx, device):
      """Construct Q4Matrix, return handle"""
      return make_q4(
          qweight,
          qzeros,
          scales,
          g_idx if g_idx is not None else none_tensor,
          device,
      )
  
file_path: text-generation-inference/server/text_generation_server/utils/gptq/exllama.py
imports: import torch
  from exllama_kernels import make_q4, q4_matmul, prepare_buffers, set_tuning_params
label_desc: Use image node_id 1 for calling a global function with example usage: ext_make_q4(qweight, qzeros, scales, g_idx, device) and returns: make_q4