*`solver_file` is the file name in Caffe's [solver](https://github.com/BVLC/caffe/blob/master/models/bvlc_googlenet/quick_solver.prototxt) format.
*`SNAPSHOT` is the index of the snapshot to start with (default: 0). If SNAPSHOT is not equal to 0, it means we continue training from the formal snapshot
*`NUM_GPU` is the number of gpu to use.
+*`SYNC_FREQ` is the option to hide IO time consuming, set SYN_FREQ > 1 usually have better speed but will consume more GPU RAM. Please propally set it to let Minerva run smoothly on your machine. (default: 1)