Einsum array argument naming: Use NameHint

arraycontext/impl/pytato/__init__.py

@@ -44,6 +44,8 @@ THE SOFTWARE.
 
 from arraycontext.context import ArrayContext, _ScalarLike
 from arraycontext.container.traversal import rec_map_array_container
+from arraycontext.metadata import NameHint
+
 import numpy as np
 from typing import Any, Callable, Union, TYPE_CHECKING, Tuple, Type
 from pytools.tag import ToTagSetConvertible
@@ -351,15 +353,14 @@ class PytatoPyOpenCLArrayContext(_BasePytatoArrayContext):
                 ary = arg
 
             if name is not None:
-                from pytato.tags import PrefixNamed
-
                 # Tagging Placeholders with naming-related tags is pointless:
                 # They already have names. It's also counterproductive, as
                 # multiple placeholders with the same name that are not
                 # also the same object are not allowed, and this would produce
                 # a different Placeholder object of the same name.
-                if not isinstance(ary, pt.Placeholder):
-                    ary = ary.tagged(PrefixNamed(name))
+                if (not isinstance(ary, pt.Placeholder)
+                        and not ary.tags_of_type(NameHint)):
+                    ary = ary.tagged(NameHint(name))
 
             return ary
 
@@ -492,15 +493,14 @@ class PytatoJAXArrayContext(_BasePytatoArrayContext):
                 ary = arg
 
             if name is not None:
-                from pytato.tags import PrefixNamed
-
                 # Tagging Placeholders with naming-related tags is pointless:
                 # They already have names. It's also counterproductive, as
                 # multiple placeholders with the same name that are not
                 # also the same object are not allowed, and this would produce
                 # a different Placeholder object of the same name.
-                if not isinstance(ary, pt.Placeholder):
-                    ary = ary.tagged(PrefixNamed(name))
+                if (not isinstance(ary, pt.Placeholder)
+                        and not ary.tags_of_type(NameHint)):
+                    ary = ary.tagged(NameHint(name))
 
             return ary