[Bug]: remove_self_loops() function is missing

[bmuaz]

Expected behavior

In matsciml\common\utils.py, def remove_self_loops() function is missing.

Actual behavior

When you open the utils.py, you can see line 60: edge_index, edge_attr = remove_self_loops(edge_index, edge_attr), where "remove_self_loops" is not defined.

Steps to reproduce the problem

Line 60: edge_index, edge_attr = remove_self_loops(edge_index, edge_attr)

Specifications

matsciml as of [9568e18]