display infinite and finite ema

ema.py

import numpy as np
import pandas as pd
import plotly.graph_objects as go
from finta import TA


if __name__ == '__main__':
    ts = pd.date_range('1/1/2000', periods=100)
    price = pd.DataFrame(np.random.randn(100, 1), index=ts, columns=['close'])

    # https://blog.csdn.net/Papageno_Xue/article/details/82705157
    ema_finite = TA.EMA(price)
    ema_infinite = TA.EMA(price, adjust=False)

    fig = go.Figure()
    fig.add_trace(go.Scatter(x=ts, y=price.iloc[:, 0],
                             mode='lines',
                             name='price'))
    fig.add_trace(go.Scatter(x=ts, y=ema_finite,
                             mode='lines',
                             name='ema-finite'))
    fig.add_trace(go.Scatter(x=ts, y=ema_infinite,
                             mode='lines',
                             name='ema-infinite'))
    fig.show()

the infinite and finite EMA will only diverge at the very first beginning period