meta hadamards

Signed-off-by: Kyle Sayers <kylesayrs@gmail.com>

Author: kylesayrs

src/compressed_tensors/transform/factory/base.py

@@ -13,8 +13,7 @@
 # limitations under the License.
 
 from abc import ABC, abstractmethod
-from collections import defaultdict
-from typing import List, Optional, Set, Tuple
+from typing import List, Optional, Set
 
 import torch
 import torch.nn.utils.parametrize as P
@@ -101,8 +100,6 @@ def apply_to_model(self, model: Module, use_tqdm=True):
         for module, arg in tqdm.tqdm(modules_args, desc=desc, disable=(not use_tqdm)):
             self._apply_to_module(module, arg)
 
-        self._update_tied_weights()
-
     def _apply_to_module(self, module: Module, args: TransformArgs):
         """
         Create transforms and apply them to the module
@@ -165,31 +162,6 @@ def output_hook(_, _input, output):
         else:
             raise NotImplementedError()
 
-    def _update_tied_weights(self):
-        """
-        Populate the `_dynamic_tied_weights_keys` attribute of transforms,
-        which is used by transformers to detect and remove shared pointers
-        during saving
-        """
-        # map from data_ptrs to keys
-        ptr_to_keys: dict[int, List[Tuple[TransformBase, str]]] = defaultdict(list)
-        for transform in self.transforms:
-            for name, param in transform.named_parameters(recurse=False):
-                # NOTE: previously asserted that parent._hf_hook.place_submodules=False
-                if has_offloaded_params(transform):
-                    param = transform._hf_hook.weights_map[name]
-                ptr_to_keys[param.data_ptr()].append((transform, name))
-
-        # populate `_dynamic_tied_weights_keys` if there is more than one key
-        # and ensure that they share tensors
-        for shared_keys in ptr_to_keys.values():
-            if len(shared_keys) > 1:
-                tensor = getattr(shared_keys[0][0], shared_keys[0][1])
-
-                for transform, name in shared_keys:
-                    transform._dynamic_tied_weights_keys.add(name)
-                    setattr(transform, name, tensor)
-
 
 class TransformBase(InternalModule, ABC):
     """
@@ -198,11 +170,7 @@ class TransformBase(InternalModule, ABC):
 
     args: TransformArgs
     weight: Parameter
-    _dynamic_tied_weights_keys: Set[str]
-
-    def __init__(self):
-        super().__init__()
-        self._dynamic_tied_weights_keys = set()
+    _dynamic_tied_weights_keys: List[str] = ["weight"]
 
     @abstractmethod
     def forward(self, value: Tensor) -> Tensor:

src/compressed_tensors/transform/utils/hadamard.py

@@ -115,13 +115,16 @@ def _fetch_hadamard_divisor(
     than forcing callers to manage the file open context
 
     :param n: size of known hadamard matrix
+    :param dtype: data type to move fetched hadamard to
+    :param device: device to move fetched hadamard to
     :return: a known hadamard matrix of size `n` if one exists, else None
     """
-    with safe_open(file_path, framework="pt", device=str(device)) as file:
+    open_device = torch.device("cpu") if device.type == "meta" else device
+    with safe_open(file_path, framework="pt", device=str(open_device)) as file:
         divisors = sorted((int(key) for key in file.keys()), reverse=True)
         for divisor in divisors:
             if n % divisor == 0 and is_pow2(n // divisor):
-                return file.get_tensor(str(divisor)).to(dtype=dtype)
+                return file.get_tensor(str(divisor)).to(dtype=dtype, device=device)
 
     return None