Fix some flaky tests in test_torch.py and test_nn.py (#46941)
Summary:
Fixed test:
- `test_is_nonzero`, this is asserting exact match, which is flaky when `TORCH_SHOW_CPP_STACKTRACES=1`, I changed this to non-exact assert
- `test_pinverse` TF32
- `test_symeig` TF32
- `test_triangular_solve_batched_many_batches_cpu_float64` precision on CPU BLAS
- `test_qr` TF32, as well as the tensor factory forgets a `dtype=dtype`
- `test_lu` TF32
- `ConvTranspose2d` TF32
- `Conv3d_1x1x1_no_bias` TF32
- `Transformer*` TF32
Pull Request resolved: https://github.com/pytorch/pytorch/pull/46941
Reviewed By: heitorschueroff
Differential Revision: D24852725
Pulled By: mruberry
fbshipit-source-id: ccd4740cc643476178d81059d1c78da34e5082ed
