# Runtime error: NotImplementedError: Cannot copy out of meta tensor; no data!

**URL:** <https://discuss.huggingface.co/t/runtime-error-notimplementederror-cannot-copy-out-of-meta-tensor-no-data/85728>\
**Category:** 🤗Transformers\
**Created:** [May 7, 2024, 11:05pm UTC](https://discuss.huggingface.co/t/runtime-error-notimplementederror-cannot-copy-out-of-meta-tensor-no-data/85728 "2024-05-07T23:05:38Z")\
**Posts on this page:** 1\
**Page:** 1

<div class="post-metadata">

**Author:** ![ayushgoel](https://avatars.discourse-cdn.com/v4/letter/a/6f9a4e/32.png) [@ayushgoel](https://discuss.huggingface.co/u/ayushgoel)\
**Post date:** [May 7, 2024, 11:05pm UTC](https://discuss.huggingface.co/t/runtime-error-notimplementederror-cannot-copy-out-of-meta-tensor-no-data/85728/1 "2024-05-07T23:05:38Z")

</div>

```auto
from transformers import LlamaConfig, LlamaForCausalLM

c = LlamaConfig(<path to config.json>)
with torch.device('meta'):
    m = LlamaForCausalLM(c)
    
w = torch.load(<path to weights.bin file>)
m.load_state_dict(w, assign=True)
m.to("cuda:0") //throws error

```

The last line throws the following error:

```auto
Traceback (most recent call last):
  File "<stdin>", line 1, in <module>
  File "/home/goelayus/.local/lib/python3.10/site-packages/transformers/modeling_utils.py", line 2692, in to
    return super().to(*args, **kwargs)
  File "/home/goelayus/.local/lib/python3.10/site-packages/torch/nn/modules/module.py", line 1152, in to
    return self._apply(convert)
  File "/home/goelayus/.local/lib/python3.10/site-packages/torch/nn/modules/module.py", line 802, in _apply
    module._apply(fn)
  File "/home/goelayus/.local/lib/python3.10/site-packages/torch/nn/modules/module.py", line 802, in _apply
    module._apply(fn)
  File "/home/goelayus/.local/lib/python3.10/site-packages/torch/nn/modules/module.py", line 802, in _apply
    module._apply(fn)
  [Previous line repeated 2 more times]
  File "/home/goelayus/.local/lib/python3.10/site-packages/torch/nn/modules/module.py", line 849, in _apply
    self._buffers[key] = fn(buf)
  File "/home/goelayus/.local/lib/python3.10/site-packages/torch/nn/modules/module.py", line 1150, in convert
    return t.to(device, dtype if t.is_floating_point() or t.is_complex() else None, non_blocking)
NotImplementedError: Cannot copy out of meta tensor; no data!

```

### Expected behavior

The model should be copied to the GPU device.