[Device map] nn.Parameter don't have children (#747)
* [Device map] nn.Parameter don't have children
* Update src/accelerate/utils/modeling.py
Co-authored-by: Sylvain Gugger <35901082+sgugger@users.noreply.github.com>
Co-authored-by: Sylvain Gugger <35901082+sgugger@users.noreply.github.com>
