How to use the keyvi.JsonDictionaryCompiler function in keyvi

def compile_file(input, output, jobs, shards):
    skipped_keys = 0

    compilers = {}
    for i in range (0, shards):
        compilers[i] = keyvi.JsonDictionaryCompiler()

    if os.path.isdir(input):
        input_files = [os.path.join(input,d) for d in os.listdir(input)]
    else:
        input_files = [input]

    for input_file in input_files:
        if input_file.endswith(".gz"):
            input_fd = gzip.open(input_file)
        else:
            input_fd = open(input_file)

        for line in input_fd:
            try:
                parts = line.split("\t")
                key = parts[0]

def compile_file(input, output, jobs, shards):
    skipped_keys = 0

    compilers = {}
    for i in range (0, shards):
        compilers[i] = keyvi.JsonDictionaryCompiler()

    if os.path.isdir(input):
        input_files = [os.path.join(input,d) for d in os.listdir(input)]
    else:
        input_files = [input]

    for input_file in input_files:
        if input_file.endswith(".gz"):
            input_fd = gzip.open(input_file)
        else:
            input_fd = open(input_file)

        for line in input_fd:
            try:
                parts = line.split("\t")
                key = parts[0]

def compile(args):
    params = {key: value for key, value in args.compiler_params}

    dict_type = args.dict_type
    if dict_type == 'json':
        dictionary = keyvi.JsonDictionaryCompiler(params)
    elif dict_type == 'string':
        dictionary = keyvi.StringDictionaryCompiler(params)
    elif dict_type == 'int':
        dictionary = keyvi.IntDictionaryCompiler(params)
    elif dict_type == 'completion':
        dictionary = keyvi.CompletionDictionaryCompiler(params)
    elif dict_type == 'key-only':
        dictionary = keyvi.KeyOnlyDictionaryCompiler(params)
    else:
        return 'Must never reach here'

    with open(args.input_file) as file_in:
        for line in file_in:
            line = line.rstrip('\n')
            try:
                splits = line.split('\t')