whats the meaning of yaml file?

If i want to change the temporal stride, frame ratio which meationed in the paper, how should i do it?
```
TRAIN:
ENABLE: True
DATASET: Mydata
BATCH_SIZE: 16
EVAL_PERIOD: 10
CHECKPOINT_PERIOD: 1
AUTO_RESUME: True
DATA:
NUM_FRAMES: 32
SAMPLING_RATE: 8
TRAIN_JITTER_SCALES: [256, 320]
TRAIN_CROP_SIZE: 224
TEST_CROP_SIZE: 256
INPUT_CHANNEL_NUM: [3, 3]
SLOWFAST:
ALPHA: 4
BETA_INV: 8
FUSION_CONV_CHANNEL_RATIO: 2
FUSION_KERNEL_SZ: 7
```