Results 2 issues of lcm

Author, is it correct that the output of Auxloss is 0 ![image](https://user-images.githubusercontent.com/57932842/96978379-df214a80-1550-11eb-9cb1-af2781737846.png)

There's a little bit of an error with the class. ![image](https://user-images.githubusercontent.com/57932842/96395494-58d6d280-11f7-11eb-9d64-023833bc2deb.png) I changed one line of code to change args.tc.classes to args.tc.num_uclasses as shown below. ![image](https://user-images.githubusercontent.com/57932842/96395651-c08d1d80-11f7-11eb-8f9e-f8d9dd07c5b4.png)