1. A method for detecting cookware, the method comprising: obtaining, by one or more computing devices, a frame of imagery captured by a vision sensor, the frame of imagery depicting a cooktop; using, by the one or more computing device, a classifier to provide an initial classification for the frame of imagery, the initial classification classifying the frame of imagery into either a first class of images depicting cookware or a second class of images not depicting cookware; providing, by the one or more computing devices, an indication to a user of whether the initial classification comprises the first class or the second class; after providing the indication, receiving, by the one or more computing devices, a user input indicating whether the initial classification is correct; and when the user input indicates that the initial classification is not correct, changing, by the one or more computing devices, the initial classification for the frame of imagery to a subsequent classification, wherein the subsequent classification comprises the second class when the initial classification comprises the first class, and wherein the subsequent classification comprises the first class when the initial classification comprises the second class.