70 lines
2.4 KiB
Python
70 lines
2.4 KiB
Python
"""
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SortinoHyperOptLossDaily
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This module defines the alternative HyperOptLoss class which can be used for
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Hyperoptimization.
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"""
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import math
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import statistics
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from datetime import datetime
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from pandas import DataFrame, date_range
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from freqtrade.optimize.hyperopt import IHyperOptLoss
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class SortinoHyperOptLossDaily(IHyperOptLoss):
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"""
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Defines the loss function for hyperopt.
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This implementation uses the Sortino Ratio calculation.
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"""
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@staticmethod
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def hyperopt_loss_function(results: DataFrame, trade_count: int,
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min_date: datetime, max_date: datetime,
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*args, **kwargs) -> float:
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"""
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Objective function, returns smaller number for more optimal results.
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Uses Sortino Ratio calculation.
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Sortino Ratio calculated as described in
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http://www.redrockcapital.com/Sortino__A__Sharper__Ratio_Red_Rock_Capital.pdf
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"""
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resample_freq = '1D'
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slippage_per_trade_ratio = 0.0005
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days_in_year = 365
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minimum_acceptable_return = 0.0
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# apply slippage per trade to profit_percent
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results.loc[:, 'profit_percent_after_slippage'] = \
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results['profit_percent'] - slippage_per_trade_ratio
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# create the index within the min_date and end max_date
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t_index = date_range(start=min_date, end=max_date, freq=resample_freq,
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normalize=True)
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sum_daily = (
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results.resample(resample_freq, on='close_time').agg(
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{"profit_percent_after_slippage": sum}).reindex(t_index).fillna(0)
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)
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total_profit = sum_daily["profit_percent_after_slippage"] - minimum_acceptable_return
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expected_returns_mean = total_profit.mean()
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sum_daily['downside_returns'] = 0
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sum_daily.loc[total_profit < 0, 'downside_returns'] = total_profit
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total_downside = sum_daily['downside_returns']
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down_stdev = statistics.pstdev(total_downside, 0)
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if (down_stdev != 0.):
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sortino_ratio = expected_returns_mean / down_stdev * math.sqrt(days_in_year)
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else:
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# Define high (negative) sortino ratio to be clear that this is NOT optimal.
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sortino_ratio = -20.
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# print(t_index, sum_daily, total_profit)
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# print(minimum_acceptable_return, expected_returns_mean, down_stdev, sortino_ratio)
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return -sortino_ratio
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