only import matplotlib and multiprocessing when needed

import argparse

import itertools

import json

import matplotlib.pyplot as plt

from multiprocessing import Pool

import numpy as np

import os

from shutil import which

        return normed_signal

    def get_changepoints(self):

        # imported here as ruptures is only used for changepoint detection

        # imported here as multiprocessing and ruptures are only used for changepoint detection

        from multiprocessing import Pool

        import ruptures

        algo = ruptures.Pelt(

        export_json(args.json_export, extra_data)

    if args.plot:

        import matplotlib.pyplot as plt

        if args.plot == "U":

            # mV

            (energyhandle,) = plt.plot(

        plt.show()

    if args.histogram:

        import matplotlib.pyplot as plt

        bin_count = args.histogram

        plt.title("EnergyTrace Data Analysis")