KEY_POSITION="key_position"
SACLE_FACTOR = "scale_factor"
THRESHOLD ="threshold"
NUM_ATTN_CANDIDATES ="num_attn_candidates" 
PENALTY_WEIGHTS="penalty_weights"
WINDOW_SIZE = "window_size"

DEFAULT_SCALE_FACTOR = 50
DEFAULT_THRESHOLD = 15
DEFAULT_NUM_ATTN_CANDIDATES = 5
DEFAULT_PENALTY_WEIGHTS = 1
DEFAULT_WINDOW_SIZE = 512