freqtrade_origin/freqtrade/vendor/qtpylib/indicators.py

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#!/usr/bin/env python
# -*- coding: utf-8 -*-
#
# QTPyLib: Quantitative Trading Python Library
# https://github.com/ranaroussi/qtpylib
#
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# Copyright 2016-2018 Ran Aroussi
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#
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# Licensed under the Apache License, Version 2.0 (the "License");
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# you may not use this file except in compliance with the License.
# You may obtain a copy of the License at
#
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# http://www.apache.org/licenses/LICENSE-2.0
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#
# Unless required by applicable law or agreed to in writing, software
# distributed under the License is distributed on an "AS IS" BASIS,
# WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
# See the License for the specific language governing permissions and
# limitations under the License.
#
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import sys
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import warnings
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from datetime import datetime, timedelta
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import numpy as np
import pandas as pd
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from pandas.core.base import PandasObject
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# =============================================
# check min, python version
if sys.version_info < (3, 4):
raise SystemError("QTPyLib requires Python version >= 3.4")
# =============================================
warnings.simplefilter(action="ignore", category=RuntimeWarning)
# =============================================
def numpy_rolling_window(data, window):
shape = data.shape[:-1] + (data.shape[-1] - window + 1, window)
strides = data.strides + (data.strides[-1],)
return np.lib.stride_tricks.as_strided(data, shape=shape, strides=strides)
def numpy_rolling_series(func):
def func_wrapper(data, window, as_source=False):
series = data.values if isinstance(data, pd.Series) else data
new_series = np.empty(len(series)) * np.nan
calculated = func(series, window)
new_series[-len(calculated):] = calculated
if as_source and isinstance(data, pd.Series):
return pd.Series(index=data.index, data=new_series)
return new_series
return func_wrapper
@numpy_rolling_series
def numpy_rolling_mean(data, window, as_source=False):
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return np.mean(numpy_rolling_window(data, window), axis=-1)
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@numpy_rolling_series
def numpy_rolling_std(data, window, as_source=False):
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return np.std(numpy_rolling_window(data, window), axis=-1, ddof=1)
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# ---------------------------------------------
def session(df, start='17:00', end='16:00'):
""" remove previous globex day from df """
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if df.empty:
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return df
# get start/end/now as decimals
int_start = list(map(int, start.split(':')))
int_start = (int_start[0] + int_start[1] - 1 / 100) - 0.0001
int_end = list(map(int, end.split(':')))
int_end = int_end[0] + int_end[1] / 100
int_now = (df[-1:].index.hour[0] + (df[:1].index.minute[0]) / 100)
# same-dat session?
is_same_day = int_end > int_start
# set pointers
curr = prev = df[-1:].index[0].strftime('%Y-%m-%d')
# globex/forex session
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if not is_same_day:
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prev = (datetime.strptime(curr, '%Y-%m-%d') -
timedelta(1)).strftime('%Y-%m-%d')
# slice
if int_now >= int_start:
df = df[df.index >= curr + ' ' + start]
else:
df = df[df.index >= prev + ' ' + start]
return df.copy()
# ---------------------------------------------
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def heikinashi(bars):
bars = bars.copy()
bars['ha_close'] = (bars['open'] + bars['high'] +
bars['low'] + bars['close']) / 4
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# ha open
bars.at[0, 'ha_open'] = (bars.at[0, 'open'] + bars.at[0, 'close']) / 2
for i in range(1, len(bars)):
bars.at[i, 'ha_open'] = (bars.at[i - 1, 'ha_open'] + bars.at[i - 1, 'ha_close']) / 2
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bars['ha_high'] = bars.loc[:, ['high', 'ha_open', 'ha_close']].max(axis=1)
bars['ha_low'] = bars.loc[:, ['low', 'ha_open', 'ha_close']].min(axis=1)
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return pd.DataFrame(index=bars.index,
data={'open': bars['ha_open'],
'high': bars['ha_high'],
'low': bars['ha_low'],
'close': bars['ha_close']})
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# ---------------------------------------------
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def tdi(series, rsi_lookback=13, rsi_smooth_len=2,
rsi_signal_len=7, bb_lookback=34, bb_std=1.6185):
rsi_data = rsi(series, rsi_lookback)
rsi_smooth = sma(rsi_data, rsi_smooth_len)
rsi_signal = sma(rsi_data, rsi_signal_len)
bb_series = bollinger_bands(rsi_data, bb_lookback, bb_std)
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return pd.DataFrame(index=series.index, data={
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"rsi": rsi_data,
"rsi_signal": rsi_signal,
"rsi_smooth": rsi_smooth,
"rsi_bb_upper": bb_series['upper'],
"rsi_bb_lower": bb_series['lower'],
"rsi_bb_mid": bb_series['mid']
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})
# ---------------------------------------------
def awesome_oscillator(df, weighted=False, fast=5, slow=34):
midprice = (df['high'] + df['low']) / 2
if weighted:
ao = (midprice.ewm(fast).mean() - midprice.ewm(slow).mean()).values
else:
ao = numpy_rolling_mean(midprice, fast) - \
numpy_rolling_mean(midprice, slow)
return pd.Series(index=df.index, data=ao)
# ---------------------------------------------
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def nans(length=1):
mtx = np.empty(length)
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mtx[:] = np.nan
return mtx
# ---------------------------------------------
def typical_price(bars):
res = (bars['high'] + bars['low'] + bars['close']) / 3.
return pd.Series(index=bars.index, data=res)
# ---------------------------------------------
def mid_price(bars):
res = (bars['high'] + bars['low']) / 2.
return pd.Series(index=bars.index, data=res)
# ---------------------------------------------
def ibs(bars):
""" Internal bar strength """
res = np.round((bars['close'] - bars['low']) /
(bars['high'] - bars['low']), 2)
return pd.Series(index=bars.index, data=res)
# ---------------------------------------------
def true_range(bars):
return pd.DataFrame({
"hl": bars['high'] - bars['low'],
"hc": abs(bars['high'] - bars['close'].shift(1)),
"lc": abs(bars['low'] - bars['close'].shift(1))
}).max(axis=1)
# ---------------------------------------------
def atr(bars, window=14, exp=False):
tr = true_range(bars)
if exp:
res = rolling_weighted_mean(tr, window)
else:
res = rolling_mean(tr, window)
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return pd.Series(res)
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# ---------------------------------------------
def crossed(series1, series2, direction=None):
if isinstance(series1, np.ndarray):
series1 = pd.Series(series1)
if isinstance(series2, (float, int, np.ndarray, np.integer, np.floating)):
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series2 = pd.Series(index=series1.index, data=series2)
if direction is None or direction == "above":
above = pd.Series((series1 > series2) & (
series1.shift(1) <= series2.shift(1)))
if direction is None or direction == "below":
below = pd.Series((series1 < series2) & (
series1.shift(1) >= series2.shift(1)))
if direction is None:
return above or below
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return above if direction == "above" else below
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def crossed_above(series1, series2):
return crossed(series1, series2, "above")
def crossed_below(series1, series2):
return crossed(series1, series2, "below")
# ---------------------------------------------
def rolling_std(series, window=200, min_periods=None):
min_periods = window if min_periods is None else min_periods
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if min_periods == window and len(series) > window:
return numpy_rolling_std(series, window, True)
else:
try:
return series.rolling(window=window, min_periods=min_periods).std()
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except Exception as e: # noqa: F841
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return pd.Series(series).rolling(window=window, min_periods=min_periods).std()
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# ---------------------------------------------
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def rolling_mean(series, window=200, min_periods=None):
min_periods = window if min_periods is None else min_periods
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if min_periods == window and len(series) > window:
return numpy_rolling_mean(series, window, True)
else:
try:
return series.rolling(window=window, min_periods=min_periods).mean()
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except Exception as e: # noqa: F841
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return pd.Series(series).rolling(window=window, min_periods=min_periods).mean()
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# ---------------------------------------------
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def rolling_min(series, window=14, min_periods=None):
min_periods = window if min_periods is None else min_periods
try:
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return series.rolling(window=window, min_periods=min_periods).min()
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except Exception as e: # noqa: F841
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return pd.Series(series).rolling(window=window, min_periods=min_periods).min()
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# ---------------------------------------------
def rolling_max(series, window=14, min_periods=None):
min_periods = window if min_periods is None else min_periods
try:
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return series.rolling(window=window, min_periods=min_periods).max()
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except Exception as e: # noqa: F841
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return pd.Series(series).rolling(window=window, min_periods=min_periods).max()
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# ---------------------------------------------
def rolling_weighted_mean(series, window=200, min_periods=None):
min_periods = window if min_periods is None else min_periods
try:
return series.ewm(span=window, min_periods=min_periods).mean()
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except Exception as e: # noqa: F841
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return pd.ewma(series, span=window, min_periods=min_periods)
# ---------------------------------------------
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def hull_moving_average(series, window=200, min_periods=None):
min_periods = window if min_periods is None else min_periods
ma = (2 * rolling_weighted_mean(series, window / 2, min_periods)) - \
rolling_weighted_mean(series, window, min_periods)
return rolling_weighted_mean(ma, np.sqrt(window), min_periods)
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# ---------------------------------------------
def sma(series, window=200, min_periods=None):
return rolling_mean(series, window=window, min_periods=min_periods)
# ---------------------------------------------
def wma(series, window=200, min_periods=None):
return rolling_weighted_mean(series, window=window, min_periods=min_periods)
# ---------------------------------------------
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def hma(series, window=200, min_periods=None):
return hull_moving_average(series, window=window, min_periods=min_periods)
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# ---------------------------------------------
def vwap(bars):
"""
calculate vwap of entire time series
(input can be pandas series or numpy array)
bars are usually mid [ (h+l)/2 ] or typical [ (h+l+c)/3 ]
"""
typical = ((bars['high'] + bars['low'] + bars['close']) / 3).values
volume = bars['volume'].values
return pd.Series(index=bars.index,
data=np.cumsum(volume * typical) / np.cumsum(volume))
# ---------------------------------------------
def rolling_vwap(bars, window=200, min_periods=None):
"""
calculate vwap using moving window
(input can be pandas series or numpy array)
bars are usually mid [ (h+l)/2 ] or typical [ (h+l+c)/3 ]
"""
min_periods = window if min_periods is None else min_periods
typical = ((bars['high'] + bars['low'] + bars['close']) / 3)
volume = bars['volume']
left = (volume * typical).rolling(window=window,
min_periods=min_periods).sum()
right = volume.rolling(window=window, min_periods=min_periods).sum()
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return pd.Series(index=bars.index, data=(left / right)
).replace([np.inf, -np.inf], float('NaN')).ffill()
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# ---------------------------------------------
def rsi(series, window=14):
"""
compute the n period relative strength indicator
"""
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# 100-(100/relative_strength)
deltas = np.diff(series)
seed = deltas[:window + 1]
# default values
ups = seed[seed > 0].sum() / window
downs = -seed[seed < 0].sum() / window
rsival = np.zeros_like(series)
rsival[:window] = 100. - 100. / (1. + ups / downs)
# period values
for i in range(window, len(series)):
delta = deltas[i - 1]
if delta > 0:
upval = delta
downval = 0
else:
upval = 0
downval = -delta
ups = (ups * (window - 1) + upval) / window
downs = (downs * (window - 1.) + downval) / window
rsival[i] = 100. - 100. / (1. + ups / downs)
# return rsival
return pd.Series(index=series.index, data=rsival)
# ---------------------------------------------
def macd(series, fast=3, slow=10, smooth=16):
"""
compute the MACD (Moving Average Convergence/Divergence)
using a fast and slow exponential moving avg'
return value is emaslow, emafast, macd which are len(x) arrays
"""
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macd_line = rolling_weighted_mean(series, window=fast) - \
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rolling_weighted_mean(series, window=slow)
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signal = rolling_weighted_mean(macd_line, window=smooth)
histogram = macd_line - signal
# return macd_line, signal, histogram
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return pd.DataFrame(index=series.index, data={
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'macd': macd_line.values,
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'signal': signal.values,
'histogram': histogram.values
})
# ---------------------------------------------
def bollinger_bands(series, window=20, stds=2):
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ma = rolling_mean(series, window=window, min_periods=1)
std = rolling_std(series, window=window, min_periods=1)
upper = ma + std * stds
lower = ma - std * stds
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return pd.DataFrame(index=series.index, data={
'upper': upper,
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'mid': ma,
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'lower': lower
})
# ---------------------------------------------
def weighted_bollinger_bands(series, window=20, stds=2):
ema = rolling_weighted_mean(series, window=window)
std = rolling_std(series, window=window)
upper = ema + std * stds
lower = ema - std * stds
return pd.DataFrame(index=series.index, data={
'upper': upper.values,
'mid': ema.values,
'lower': lower.values
})
# ---------------------------------------------
def returns(series):
try:
res = (series / series.shift(1) -
1).replace([np.inf, -np.inf], float('NaN'))
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except Exception as e: # noqa: F841
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res = nans(len(series))
return pd.Series(index=series.index, data=res)
# ---------------------------------------------
def log_returns(series):
try:
res = np.log(series / series.shift(1)
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).replace([np.inf, -np.inf], float('NaN'))
except Exception as e: # noqa: F841
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res = nans(len(series))
return pd.Series(index=series.index, data=res)
# ---------------------------------------------
def implied_volatility(series, window=252):
try:
logret = np.log(series / series.shift(1)
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).replace([np.inf, -np.inf], float('NaN'))
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res = numpy_rolling_std(logret, window) * np.sqrt(window)
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except Exception as e: # noqa: F841
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res = nans(len(series))
return pd.Series(index=series.index, data=res)
# ---------------------------------------------
def keltner_channel(bars, window=14, atrs=2):
typical_mean = rolling_mean(typical_price(bars), window)
atrval = atr(bars, window) * atrs
upper = typical_mean + atrval
lower = typical_mean - atrval
return pd.DataFrame(index=bars.index, data={
'upper': upper.values,
'mid': typical_mean.values,
'lower': lower.values
})
# ---------------------------------------------
def roc(series, window=14):
"""
compute rate of change
"""
res = (series - series.shift(window)) / series.shift(window)
return pd.Series(index=series.index, data=res)
# ---------------------------------------------
def cci(series, window=14):
"""
compute commodity channel index
"""
price = typical_price(series)
typical_mean = rolling_mean(price, window)
res = (price - typical_mean) / (.015 * np.std(typical_mean))
return pd.Series(index=series.index, data=res)
# ---------------------------------------------
def stoch(df, window=14, d=3, k=3, fast=False):
"""
compute the n period relative strength indicator
http://excelta.blogspot.co.il/2013/09/stochastic-oscillator-technical.html
"""
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my_df = pd.DataFrame(index=df.index)
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my_df['rolling_max'] = df['high'].rolling(window).max()
my_df['rolling_min'] = df['low'].rolling(window).min()
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my_df['fast_k'] = (
100 * (df['close'] - my_df['rolling_min']) /
(my_df['rolling_max'] - my_df['rolling_min'])
)
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my_df['fast_d'] = my_df['fast_k'].rolling(d).mean()
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if fast:
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return my_df.loc[:, ['fast_k', 'fast_d']]
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my_df['slow_k'] = my_df['fast_k'].rolling(k).mean()
my_df['slow_d'] = my_df['slow_k'].rolling(d).mean()
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return my_df.loc[:, ['slow_k', 'slow_d']]
# ---------------------------------------------
def zlma(series, window=20, min_periods=None, kind="ema"):
"""
John Ehlers' Zero lag (exponential) moving average
https://en.wikipedia.org/wiki/Zero_lag_exponential_moving_average
"""
min_periods = window if min_periods is None else min_periods
lag = (window - 1) // 2
series = 2 * series - series.shift(lag)
if kind in ['ewm', 'ema']:
return wma(series, lag, min_periods)
elif kind == "hma":
return hma(series, lag, min_periods)
return sma(series, lag, min_periods)
def zlema(series, window, min_periods=None):
return zlma(series, window, min_periods, kind="ema")
def zlsma(series, window, min_periods=None):
return zlma(series, window, min_periods, kind="sma")
def zlhma(series, window, min_periods=None):
return zlma(series, window, min_periods, kind="hma")
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# ---------------------------------------------
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def zscore(bars, window=20, stds=1, col='close'):
""" get zscore of price """
std = numpy_rolling_std(bars[col], window)
mean = numpy_rolling_mean(bars[col], window)
return (bars[col] - mean) / (std * stds)
# ---------------------------------------------
def pvt(bars):
""" Price Volume Trend """
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trend = ((bars['close'] - bars['close'].shift(1)) /
bars['close'].shift(1)) * bars['volume']
return trend.cumsum()
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def chopiness(bars, window=14):
atrsum = true_range(bars).rolling(window).sum()
highs = bars['high'].rolling(window).max()
lows = bars['low'].rolling(window).min()
return 100 * np.log10(atrsum / (highs - lows)) / np.log10(window)
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# =============================================
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PandasObject.session = session
PandasObject.atr = atr
PandasObject.bollinger_bands = bollinger_bands
PandasObject.cci = cci
PandasObject.crossed = crossed
PandasObject.crossed_above = crossed_above
PandasObject.crossed_below = crossed_below
PandasObject.heikinashi = heikinashi
PandasObject.hull_moving_average = hull_moving_average
PandasObject.ibs = ibs
PandasObject.implied_volatility = implied_volatility
PandasObject.keltner_channel = keltner_channel
PandasObject.log_returns = log_returns
PandasObject.macd = macd
PandasObject.returns = returns
PandasObject.roc = roc
PandasObject.rolling_max = rolling_max
PandasObject.rolling_min = rolling_min
PandasObject.rolling_mean = rolling_mean
PandasObject.rolling_std = rolling_std
PandasObject.rsi = rsi
PandasObject.stoch = stoch
PandasObject.zscore = zscore
PandasObject.pvt = pvt
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PandasObject.chopiness = chopiness
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PandasObject.tdi = tdi
PandasObject.true_range = true_range
PandasObject.mid_price = mid_price
PandasObject.typical_price = typical_price
PandasObject.vwap = vwap
PandasObject.rolling_vwap = rolling_vwap
PandasObject.weighted_bollinger_bands = weighted_bollinger_bands
PandasObject.rolling_weighted_mean = rolling_weighted_mean
PandasObject.sma = sma
PandasObject.wma = wma
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PandasObject.ema = wma
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PandasObject.hma = hma
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PandasObject.zlsma = zlsma
PandasObject.zlwma = zlema
PandasObject.zlema = zlema
PandasObject.zlhma = zlhma
PandasObject.zlma = zlma