Tweak `get_var_by_name`

[ricardoV94]

Description

This function has an unused argument: ids.

More importantly it also looks for matches in inner_graphs. I would make this behavior optional and non-default, since variables in inner_graphs are not really variables of the graph.

pytensor/pytensor/graph/basic.py

Lines 2034 to 2071 in ff98ab8

	def get_var_by_name(
	graphs: Iterable[Variable], target_var_id: str, ids: str = "CHAR"
	) -> tuple[Variable, ...]:
	r"""Get variables in a graph using their names.
	Parameters
	----------
	graphs:
	The graph, or graphs, to search.
	target_var_id:
	The name to match against either ``Variable.name`` or
	``Variable.auto_name``.
	Returns
	-------
	A ``tuple`` containing all the `Variable`\s that match `target_var_id`.
	"""
	from pytensor.graph.op import HasInnerGraph
	def expand(r) -> list[Variable] | None:
	if not r.owner:
	return None
	res = list(r.owner.inputs)
	if isinstance(r.owner.op, HasInnerGraph):
	res.extend(r.owner.op.inner_outputs)
	return res
	results: tuple[Variable, ...] = ()
	for var in walk(graphs, expand, False):
	var = cast(Variable, var)
	if target_var_id == var.name or target_var_id == var.auto_name:
	results += (var,)
	return results

[prajwalun]

@ricardoV94 Opened a PR to address this issue: #1441. Let me know if any further changes or test refinements are needed!