Building off of Walter's response (and his included link), since the temp is captured by Canon in the EXIF, you can also use this to determine if the camera is getting hotter with ML than without. You can use shooting video to get the camera heated up (if you think necessary) and press the shutter to capture a still with the temp in its EXIF. As Walter points out, ML developers have used this to aid ML's calculation of temp, but it can also be used to do rough comparisons between ML and non-ML if you suspect a significant difference.