renamed code to `quant_map` in serialized QState

bitsandbytes/functional.py

@@ -571,14 +571,14 @@ class QuantState:
     """container for quantization state components to work with Params4bit and similar clases"""
     valid_quant_types = ('fp4', 'nf4')
     valid_qs_type_keys = [f"quant_state.bitsandbytes__{x}" for x in valid_quant_types]
-    valid_qs_keys = ['absmax', 'code', 'nested_absmax', 'nested_code', 'quant_state', 
+    valid_qs_keys = ['absmax', 'quant_map', 'nested_absmax', 'nested_quant_map', 'quant_state', 
                      'quant_type', 'blocksize', 'dtype', 'shape', 'nested_blocksize', 'nested_dtype', 'nested_offset']
 
     
     def __init__(self, absmax, shape=None, code=None, blocksize=None, quant_type=None, dtype=None, offset=None, state2=None):
         self.absmax = absmax
         self.shape = shape
-        self.code = code  # TODO consider renaming to `buckets / centroids / scale`
+        self.code = code
         self.dtype = dtype
         self.blocksize = blocksize
         self.quant_type = quant_type
@@ -627,7 +627,7 @@ class QuantState:
             state2 = cls(
                 absmax=qs_dict['nested_absmax'].to(device),
                 blocksize=qs_dict['nested_blocksize'],
-                code=qs_dict['nested_code'].to(device),
+                code=qs_dict['nested_quant_map'].to(device),
                 dtype=getattr(torch, qs_dict['nested_dtype']),
             )
         else:
@@ -637,7 +637,7 @@ class QuantState:
             quant_type=qs_dict['quant_type'],
             absmax=qs_dict['absmax'].to(device),
             blocksize=qs_dict['blocksize'],
-            code=qs_dict['code'].to(device),
+            code=qs_dict['quant_map'].to(device),
             dtype=getattr(torch, qs_dict['dtype']),
             shape=torch.Size(qs_dict['shape']),
             offset=offset,
@@ -654,7 +654,7 @@ class QuantState:
             'quant_type': self.quant_type,
             'absmax': self.absmax,
             'blocksize': self.blocksize,
-            'code': self.code,                      
+            'quant_map': self.code,                      
             'dtype': str(self.dtype).strip('torch.'),
             'shape': tuple(self.shape) if self.nested else None,
         }
@@ -662,7 +662,7 @@ class QuantState:
             qs_dict.update({
                 'nested_absmax': self.state2.absmax,
                 'nested_blocksize': self.state2.blocksize,
-                'nested_code': self.state2.code,
+                'nested_quant_map': self.state2.code,
                 'nested_dtype': str(self.state2.dtype).strip('torch.'),
                 'nested_offset': self.offset.item(),
             })