E-TE0612 — Unsupported argument type for is_same

Error Type	Type Error
Phase	calling jm.is_same
Python exception	TypeError (builtin)

Message

`is_same` does not support values of type `{type_name}`.

Possible fix: pass JijModeling objects (such as `Problem`, `Constraint`, placeholders, decision variables, or expressions) or iterables of them.

({type_name} is the Python type shared by both arguments)

Cause

Both arguments to jm.is_same have the same Python type, but values of that type cannot be compared by is_same: they are neither JijModeling objects nor iterables. jm.is_same first tries to compare its arguments as two JijModeling objects of the same kind — where numbers, strings, booleans, and tuples, lists, or dicts of such values also count as expressions — and then falls back to consuming both arguments as iterables and comparing them element by element. Values that fit neither interpretation, such as None, a function taking no arguments, or objects from unrelated libraries, trigger this error; for example jm.is_same(None, None).

Fix

Pass JijModeling objects (or iterables of them) to jm.is_same, and compare everything else with Python’s own ==:

import jijmodeling as jm

problem1 = jm.Problem("p")
problem2 = jm.Problem("p")
a = problem1.Placeholder("a", dtype=float)
b = problem2.Placeholder("a", dtype=float)

assert jm.is_same(a, b)

If one of the values can be None, guard the call, for example x is not None and jm.is_same(x, y).

Related

E-TE0613 — the same situation with two arguments of different Python types. E-TE0614 — an incomparable pair of elements inside two iterables. E-TE0615 — two iterables of different lengths.