chore: import upstream snapshot with attribution

invokeai/backend/patches/layers/param_shape_utils.py

@@ -0,0 +1,19 @@
+import torch
+
+try:
+    from bitsandbytes.nn.modules import Params4bit
+
+    bnb_available: bool = True
+except ImportError:
+    bnb_available: bool = False
+
+
+def get_param_shape(param: torch.Tensor) -> torch.Size:
+    """A helper function to get the shape of a parameter that handles `bitsandbytes.nn.Params4Bit` correctly."""
+    # Accessing the `.shape` attribute of `bitsandbytes.nn.Params4Bit` will return an incorrect result. Instead, we must
+    # access the `.quant_state.shape` attribute.
+    if bnb_available and type(param) is Params4bit:  # type: ignore
+        quant_state = param.quant_state
+        if quant_state is not None:
+            return quant_state.shape
+    return param.shape