def parse_kipoi_colname(colname):
    """Parse kipoi column name into:
    (model, version, type)
    input: "KV:dir:examples/rbp:DIFF"
    output: ("dir", "examples/rbp", "DIFF")
    """
    _, source_type, model, diff_type = colname.split(":", 3)
    return source_type, model, diff_type