dvc/stage/params.py
class StageParams:
PARAM_MD5 = "md5"
PARAM_CMD = "cmd"
PARAM_WDIR = "wdir"
PARAM_DEPS = "deps"
PARAM_OUTS = "outs"
PARAM_LOCKED = "locked" # backward compatibility
PARAM_FROZEN = "frozen"
PARAM_META = "meta"
PARAM_ALWAYS_CHANGED = "always_changed"
PARAM_PARAMS = "params"
PARAM_METRICS = "metrics"
PARAM_PLOTS = "plots"
PARAM_DESC = "desc"