A lighting fixture employing a solid-state light source and an ambient light sensor is disclosed. The valve body includes a gas passage therein. Thus, by detecting a change in voltage at such a circuit node in association with a programmable state change, embodiments may determine that respective circuit programmability is functional. Accordingly, even if the developing fluid is reused in the developing process in multiple times, it is possible to make sure of the uniformity in development. Specifically, a hidden, higher-level abstraction space is learned that is meaningful for the multi-labeled examples in the source domain.