199 lines
7.9 KiB
Python
199 lines
7.9 KiB
Python
"""
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IHyperStrategy interface, hyperoptable Parameter class.
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This module defines a base class for auto-hyperoptable strategies.
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"""
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import logging
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from pathlib import Path
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from typing import Any, Dict, Iterator, List, Tuple, Type, Union
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from freqtrade.constants import Config
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from freqtrade.exceptions import OperationalException
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from freqtrade.misc import deep_merge_dicts, json_load
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from freqtrade.optimize.hyperopt_tools import HyperoptTools
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from freqtrade.strategy.parameters import BaseParameter
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logger = logging.getLogger(__name__)
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class HyperStrategyMixin:
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"""
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A helper base class which allows HyperOptAuto class to reuse implementations of buy/sell
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strategy logic.
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"""
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def __init__(self, config: Config, *args, **kwargs):
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"""
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Initialize hyperoptable strategy mixin.
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"""
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self.config = config
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self.ft_buy_params: List[BaseParameter] = []
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self.ft_sell_params: List[BaseParameter] = []
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self.ft_protection_params: List[BaseParameter] = []
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params = self.load_params_from_file()
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params = params.get('params', {})
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self._ft_params_from_file = params
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# Init/loading of parameters is done as part of ft_bot_start().
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def enumerate_parameters(self, category: str = None) -> Iterator[Tuple[str, BaseParameter]]:
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"""
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Find all optimizable parameters and return (name, attr) iterator.
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:param category:
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:return:
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"""
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if category not in ('buy', 'sell', 'protection', None):
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raise OperationalException(
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'Category must be one of: "buy", "sell", "protection", None.')
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if category is None:
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params = self.ft_buy_params + self.ft_sell_params + self.ft_protection_params
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else:
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params = getattr(self, f"ft_{category}_params")
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for par in params:
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yield par.name, par
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@classmethod
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def detect_all_parameters(cls) -> Dict:
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""" Detect all parameters and return them as a list"""
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params: Dict[str, Any] = {
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'buy': list(detect_parameters(cls, 'buy')),
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'sell': list(detect_parameters(cls, 'sell')),
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'protection': list(detect_parameters(cls, 'protection')),
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}
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params.update({
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'count': len(params['buy'] + params['sell'] + params['protection'])
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})
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return params
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def ft_load_params_from_file(self) -> None:
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"""
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Load Parameters from parameter file
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Should/must run before config values are loaded in strategy_resolver.
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"""
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if self._ft_params_from_file:
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# Set parameters from Hyperopt results file
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params = self._ft_params_from_file
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self.minimal_roi = params.get('roi', getattr(self, 'minimal_roi', {}))
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self.stoploss = params.get('stoploss', {}).get(
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'stoploss', getattr(self, 'stoploss', -0.1))
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trailing = params.get('trailing', {})
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self.trailing_stop = trailing.get(
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'trailing_stop', getattr(self, 'trailing_stop', False))
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self.trailing_stop_positive = trailing.get(
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'trailing_stop_positive', getattr(self, 'trailing_stop_positive', None))
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self.trailing_stop_positive_offset = trailing.get(
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'trailing_stop_positive_offset',
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getattr(self, 'trailing_stop_positive_offset', 0))
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self.trailing_only_offset_is_reached = trailing.get(
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'trailing_only_offset_is_reached',
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getattr(self, 'trailing_only_offset_is_reached', 0.0))
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def ft_load_hyper_params(self, hyperopt: bool = False) -> None:
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"""
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Load Hyperoptable parameters
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Prevalence:
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* Parameters from parameter file
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* Parameters defined in parameters objects (buy_params, sell_params, ...)
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* Parameter defaults
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"""
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buy_params = deep_merge_dicts(self._ft_params_from_file.get('buy', {}),
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getattr(self, 'buy_params', {}))
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sell_params = deep_merge_dicts(self._ft_params_from_file.get('sell', {}),
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getattr(self, 'sell_params', {}))
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protection_params = deep_merge_dicts(self._ft_params_from_file.get('protection', {}),
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getattr(self, 'protection_params', {}))
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self._ft_load_params(buy_params, 'buy', hyperopt)
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self._ft_load_params(sell_params, 'sell', hyperopt)
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self._ft_load_params(protection_params, 'protection', hyperopt)
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def load_params_from_file(self) -> Dict:
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filename_str = getattr(self, '__file__', '')
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if not filename_str:
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return {}
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filename = Path(filename_str).with_suffix('.json')
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if filename.is_file():
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logger.info(f"Loading parameters from file {filename}")
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try:
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with filename.open('r') as f:
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params = json_load(f)
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if params.get('strategy_name') != self.__class__.__name__:
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raise OperationalException('Invalid parameter file provided.')
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return params
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except ValueError:
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logger.warning("Invalid parameter file format.")
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return {}
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logger.info("Found no parameter file.")
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return {}
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def _ft_load_params(self, params: Dict, space: str, hyperopt: bool = False) -> None:
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"""
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Set optimizable parameter values.
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:param params: Dictionary with new parameter values.
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"""
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if not params:
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logger.info(f"No params for {space} found, using default values.")
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param_container: List[BaseParameter] = getattr(self, f"ft_{space}_params")
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for attr_name, attr in detect_parameters(self, space):
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attr.name = attr_name
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attr.in_space = hyperopt and HyperoptTools.has_space(self.config, space)
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if not attr.category:
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attr.category = space
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param_container.append(attr)
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if params and attr_name in params:
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if attr.load:
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attr.value = params[attr_name]
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logger.info(f'Strategy Parameter: {attr_name} = {attr.value}')
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else:
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logger.warning(f'Parameter "{attr_name}" exists, but is disabled. '
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f'Default value "{attr.value}" used.')
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else:
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logger.info(f'Strategy Parameter(default): {attr_name} = {attr.value}')
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def get_no_optimize_params(self):
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"""
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Returns list of Parameters that are not part of the current optimize job
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"""
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params: Dict[str, Dict] = {
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'buy': {},
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'sell': {},
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'protection': {},
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}
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for name, p in self.enumerate_parameters():
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if not p.optimize or not p.in_space:
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params[p.category][name] = p.value
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return params
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def detect_parameters(
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obj: Union[HyperStrategyMixin, Type[HyperStrategyMixin]],
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category: str
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) -> Iterator[Tuple[str, BaseParameter]]:
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"""
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Detect all parameters for 'category' for "obj"
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:param obj: Strategy object or class
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:param category: category - usually `'buy', 'sell', 'protection',...
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"""
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for attr_name in dir(obj):
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if not attr_name.startswith('__'): # Ignore internals, not strictly necessary.
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attr = getattr(obj, attr_name)
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if issubclass(attr.__class__, BaseParameter):
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if (attr_name.startswith(category + '_')
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and attr.category is not None and attr.category != category):
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raise OperationalException(
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f'Inconclusive parameter name {attr_name}, category: {attr.category}.')
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if (category == attr.category or
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(attr_name.startswith(category + '_') and attr.category is None)):
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yield attr_name, attr
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