in artifacts/count_people/infer.py [0:0]
def get_output_file():
    global output_count
    global output_pattern
    global num_outputs
    filename = output_pattern
    try:
        filename = filename % output_count
    except:
        pass
    finally:
        output_count = output_count + 1
        if output_count >= num_outputs:
            output_count = 0
    return filename