Don't make parameters have symbolic shapes (#85809)
Parameters won't change size across iterations of the
training loop, so this is a cost-free optimization that
avoids us having to do symbolic math over parameters.
Signed-off-by: Edward Z. Yang <ezyang@fb.com>
Pull Request resolved: https://github.com/pytorch/pytorch/pull/85809
Approved by: https://github.com/albanD
