Fixes on run.py arguemtns

[wow056]

Includes

1. Fix sample_run.py step arguments to store boolean value. (Previously, it stored string value like 'True' if I specified arguements)
2. Grouping arguments to make --help readable

> python run_sample.py -h
usage: run_sample.py [-h] --voc12_root VOC12_ROOT [--num_workers NUM_WORKERS]
                     [--train_list TRAIN_LIST] [--val_list VAL_LIST]
                     [--infer_list INFER_LIST]
                     [--chainer_eval_set CHAINER_EVAL_SET]
                     [--cam_network CAM_NETWORK]
                     [--cam_crop_size CAM_CROP_SIZE]
                     [--cam_batch_size CAM_BATCH_SIZE]
                     [--cam_num_epoches CAM_NUM_EPOCHES]
                     [--cam_learning_rate CAM_LEARNING_RATE]
                     [--cam_weight_decay CAM_WEIGHT_DECAY]
                     [--cam_eval_thres CAM_EVAL_THRES]
                     [--cam_scales CAM_SCALES] [--conf_fg_thres CONF_FG_THRES]
                     [--conf_bg_thres CONF_BG_THRES]
                     [--irn_network IRN_NETWORK]
                     [--irn_crop_size IRN_CROP_SIZE]
                     [--irn_batch_size IRN_BATCH_SIZE]
                     [--irn_num_epoches IRN_NUM_EPOCHES]
                     [--irn_learning_rate IRN_LEARNING_RATE]
                     [--irn_weight_decay IRN_WEIGHT_DECAY] [--beta BETA]
                     [--exp_times EXP_TIMES]
                     [--ins_seg_bg_thres INS_SEG_BG_THRES]
                     [--sem_seg_bg_thres SEM_SEG_BG_THRES]
                     [--log_name LOG_NAME]
                     [--cam_weights_name CAM_WEIGHTS_NAME]
                     [--irn_weights_name IRN_WEIGHTS_NAME]
                     [--cam_out_dir CAM_OUT_DIR]
                     [--ir_label_out_dir IR_LABEL_OUT_DIR]
                     [--sem_seg_out_dir SEM_SEG_OUT_DIR]
                     [--ins_seg_out_dir INS_SEG_OUT_DIR] [--train_cam]
                     [--make_cam] [--eval_cam] [--cam_to_ir_label]
                     [--train_irn] [--make_ins_seg] [--eval_ins_seg]
                     [--make_sem_seg] [--eval_sem_seg]

optional arguments:
  -h, --help            show this help message and exit

Environment:
  --voc12_root VOC12_ROOT
                        Path to VOC 2012 Devkit, must contain ./JPEGImages as
                        subdirectory.
  --num_workers NUM_WORKERS

Dataset:
  --train_list TRAIN_LIST
  --val_list VAL_LIST
  --infer_list INFER_LIST
                        voc12/train_aug.txt to train a fully supervised model,
                        voc12/train.txt or voc12/val.txt to quickly check the
                        quality of the labels.
  --chainer_eval_set CHAINER_EVAL_SET

Class Activation Map:
  --cam_network CAM_NETWORK
  --cam_crop_size CAM_CROP_SIZE
  --cam_batch_size CAM_BATCH_SIZE
  --cam_num_epoches CAM_NUM_EPOCHES
  --cam_learning_rate CAM_LEARNING_RATE
  --cam_weight_decay CAM_WEIGHT_DECAY
  --cam_eval_thres CAM_EVAL_THRES
  --cam_scales CAM_SCALES
                        Multi-scale inferences

Mining Inter-pixel Relations:
  --conf_fg_thres CONF_FG_THRES
  --conf_bg_thres CONF_BG_THRES

Inter-pixel Relation Network (IRNet):
  --irn_network IRN_NETWORK
  --irn_crop_size IRN_CROP_SIZE
  --irn_batch_size IRN_BATCH_SIZE
  --irn_num_epoches IRN_NUM_EPOCHES
  --irn_learning_rate IRN_LEARNING_RATE
  --irn_weight_decay IRN_WEIGHT_DECAY

Random Walk Params:
  --beta BETA
  --exp_times EXP_TIMES
                        Hyper-parameter that controls the number of random
                        walk iterations,The random walk is performed
                        2^{exp_times}.
  --ins_seg_bg_thres INS_SEG_BG_THRES
  --sem_seg_bg_thres SEM_SEG_BG_THRES

Output Path:
  --log_name LOG_NAME
  --cam_weights_name CAM_WEIGHTS_NAME
  --irn_weights_name IRN_WEIGHTS_NAME
  --cam_out_dir CAM_OUT_DIR
  --ir_label_out_dir IR_LABEL_OUT_DIR
  --sem_seg_out_dir SEM_SEG_OUT_DIR
  --ins_seg_out_dir INS_SEG_OUT_DIR

Step:
  --train_cam
  --make_cam
  --eval_cam
  --cam_to_ir_label
  --train_irn
  --make_ins_seg
  --eval_ins_seg
  --make_sem_seg
  --eval_sem_seg