Fix deprecation warning.

Change the import of `Iterable` from `collections.Iterable` to `collections.abc.Iterable` to future-proof against Python 3.7.8.

Fix deprecation warning.
513c676a · rpgoldman · Robert P. Goldman · 42d874ef · 513c676a
--- a/theano/tensor/var.py
+++ b/theano/tensor/var.py
@@ -465,7 +465,7 @@ class _tensor_py_operators(object):
                    (hasattr(args_el, 'dtype') and args_el.dtype == 'bool')):
                return True
            if (not isinstance(args_el, theano.tensor.Variable) and
-                    isinstance(args_el, collections.Iterable)):
+                    isinstance(args_el, collections.abc.Iterable)):
                for el in args_el:
                    if includes_bool(el):
                        return True