# w4_per_block

### w4_per_block(\*, block_size=32, axis=None)

int4 weight-only quantization, per-block symmetric, block_size defaults to 32.

* **Parameters:**
  * **block_size** (*int*) – Block size along the input channel dimension (default 32).
  * **axis** (*int* *|* *None*) – Axis to apply blocks along.
    When `None` (default), the axis is auto-resolved based on the module type
    during quantization.
* **Returns:**
  int4 per-block weight-only module configuration.
* **Return type:**
  [ModuleQuantizerConfig](coreai_opt.quantization.ModuleQuantizerConfig.md#coreai_opt.quantization.ModuleQuantizerConfig)