Users may use the option (-s, --set) multiple times in a command line. However, the parser (get_bias_weights) accepts the argument appearing for the first time, ignoring the rest. This may confuse users. The default behavior should accept all arguments as follows:
-s label_bias=LABEL1:WEIGHT1,LABEL2:WEIGHT2
-s label_bias=LABEL1:WEIGHT1 -s label_bias=LABEL2:WEIGHT2