593 lines
24 KiB
Python
593 lines
24 KiB
Python
import copy
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import datetime
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import json
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import logging
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import pickle as pk
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import shutil
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from pathlib import Path
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from typing import Any, Dict, List, Tuple
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import numpy as np
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import pandas as pd
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from joblib import dump, load
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from pandas import DataFrame
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from sklearn.metrics.pairwise import pairwise_distances
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from sklearn.model_selection import train_test_split
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from freqtrade.configuration import TimeRange
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SECONDS_IN_DAY = 86400
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logger = logging.getLogger(__name__)
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class FreqaiDataKitchen:
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"""
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Class designed to handle all the data for the IFreqaiModel class model.
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Functionalities include holding, saving, loading, and analyzing the data.
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author: Robert Caulk, rob.caulk@gmail.com
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"""
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def __init__(self, config: Dict[str, Any], dataframe: DataFrame):
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self.full_dataframe = dataframe
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self.data: Dict[Any, Any] = {}
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self.data_dictionary: Dict[Any, Any] = {}
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self.config = config
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self.freqai_config = config["freqai"]
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self.predictions = np.array([])
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self.do_predict = np.array([])
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self.target_mean = np.array([])
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self.target_std = np.array([])
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self.model_path = Path()
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self.model_filename = ""
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self.full_timerange = self.create_fulltimerange(
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self.config["timerange"], self.freqai_config["train_period"]
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)
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(self.training_timeranges, self.backtesting_timeranges) = self.split_timerange(
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self.full_timerange,
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config["freqai"]["train_period"],
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config["freqai"]["backtest_period"],
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)
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def save_data(self, model: Any) -> None:
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"""
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Saves all data associated with a model for a single sub-train time range
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:params:
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:model: User trained model which can be reused for inferencing to generate
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predictions
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"""
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if not self.model_path.is_dir():
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self.model_path.mkdir(parents=True, exist_ok=True)
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save_path = Path(self.model_path)
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# Save the trained model
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dump(model, save_path / str(self.model_filename + "_model.joblib"))
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self.data["model_path"] = self.model_path
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self.data["model_filename"] = self.model_filename
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self.data["training_features_list"] = list(self.data_dictionary["train_features"].columns)
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# store the metadata
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with open(save_path / str(self.model_filename + "_metadata.json"), "w") as fp:
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json.dump(self.data, fp, default=self.np_encoder)
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# save the train data to file so we can check preds for area of applicability later
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self.data_dictionary["train_features"].to_pickle(
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save_path / str(self.model_filename + "_trained_df.pkl")
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)
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return
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def load_data(self) -> Any:
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"""
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loads all data required to make a prediction on a sub-train time range
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:returns:
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:model: User trained model which can be inferenced for new predictions
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"""
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model = load(self.model_path / str(self.model_filename + "_model.joblib"))
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with open(self.model_path / str(self.model_filename + "_metadata.json"), "r") as fp:
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self.data = json.load(fp)
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self.training_features_list = self.data["training_features_list"]
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# if self.data.get("training_features_list"):
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# self.training_features_list = [*self.data.get("training_features_list")]
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self.data_dictionary["train_features"] = pd.read_pickle(
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self.model_path / str(self.model_filename + "_trained_df.pkl")
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)
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self.model_path = self.data["model_path"]
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self.model_filename = self.data["model_filename"]
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if self.config["freqai"]["feature_parameters"]["principal_component_analysis"]:
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self.pca = pk.load(
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open(self.model_path / str(self.model_filename + "_pca_object.pkl"), "rb")
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)
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return model
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def make_train_test_datasets(
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self, filtered_dataframe: DataFrame, labels: DataFrame
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) -> Dict[Any, Any]:
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"""
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Given the dataframe for the full history for training, split the data into
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training and test data according to user specified parameters in configuration
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file.
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:filtered_dataframe: cleaned dataframe ready to be split.
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:labels: cleaned labels ready to be split.
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"""
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if self.config["freqai"]["feature_parameters"]["weight_factor"] > 0:
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weights = self.set_weights_higher_recent(len(filtered_dataframe))
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else:
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weights = np.ones(len(filtered_dataframe))
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(
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train_features,
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test_features,
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train_labels,
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test_labels,
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train_weights,
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test_weights,
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) = train_test_split(
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filtered_dataframe[: filtered_dataframe.shape[0]],
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labels,
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weights,
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**self.config["freqai"]["data_split_parameters"]
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)
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return self.build_data_dictionary(
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train_features, test_features, train_labels, test_labels, train_weights, test_weights
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)
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def filter_features(
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self,
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unfiltered_dataframe: DataFrame,
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training_feature_list: List,
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labels: DataFrame = pd.DataFrame(),
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training_filter: bool = True,
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) -> Tuple[DataFrame, DataFrame]:
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"""
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Filter the unfiltered dataframe to extract the user requested features and properly
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remove all NaNs. Any row with a NaN is removed from training dataset or replaced with
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0s in the prediction dataset. However, prediction dataset do_predict will reflect any
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row that had a NaN and will shield user from that prediction.
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:params:
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:unfiltered_dataframe: the full dataframe for the present training period
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:training_feature_list: list, the training feature list constructed by
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self.build_feature_list() according to user specified parameters in the configuration file.
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:labels: the labels for the dataset
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:training_filter: boolean which lets the function know if it is training data or
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prediction data to be filtered.
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:returns:
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:filtered_dataframe: dataframe cleaned of NaNs and only containing the user
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requested feature set.
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:labels: labels cleaned of NaNs.
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"""
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filtered_dataframe = unfiltered_dataframe.filter(training_feature_list, axis=1)
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drop_index = pd.isnull(filtered_dataframe).any(1) # get the rows that have NaNs,
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drop_index = drop_index.replace(True, 1).replace(False, 0) # pep8 requirement.
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if (
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training_filter
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): # we don't care about total row number (total no. datapoints) in training, we only care
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# about removing any row with NaNs
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drop_index_labels = pd.isnull(labels)
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drop_index_labels = drop_index_labels.replace(True, 1).replace(False, 0)
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filtered_dataframe = filtered_dataframe[
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(drop_index == 0) & (drop_index_labels == 0)
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] # dropping values
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labels = labels[
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(drop_index == 0) & (drop_index_labels == 0)
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] # assuming the labels depend entirely on the dataframe here.
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logger.info(
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"dropped %s training points due to NaNs, ensure all historical data downloaded",
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len(unfiltered_dataframe) - len(filtered_dataframe),
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)
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self.data["filter_drop_index_training"] = drop_index
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else:
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# we are backtesting so we need to preserve row number to send back to strategy,
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# so now we use do_predict to avoid any prediction based on a NaN
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drop_index = pd.isnull(filtered_dataframe).any(1)
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self.data["filter_drop_index_prediction"] = drop_index
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filtered_dataframe.fillna(0, inplace=True)
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# replacing all NaNs with zeros to avoid issues in 'prediction', but any prediction
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# that was based on a single NaN is ultimately protected from buys with do_predict
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drop_index = ~drop_index
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self.do_predict = np.array(drop_index.replace(True, 1).replace(False, 0))
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logger.info(
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"dropped %s of %s prediction data points due to NaNs.",
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len(self.do_predict) - self.do_predict.sum(),
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len(filtered_dataframe),
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)
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return filtered_dataframe, labels
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def build_data_dictionary(
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self,
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train_df: DataFrame,
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test_df: DataFrame,
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train_labels: DataFrame,
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test_labels: DataFrame,
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train_weights: Any,
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test_weights: Any,
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) -> Dict:
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self.data_dictionary = {
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"train_features": train_df,
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"test_features": test_df,
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"train_labels": train_labels,
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"test_labels": test_labels,
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"train_weights": train_weights,
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"test_weights": test_weights,
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}
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return self.data_dictionary
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def standardize_data(self, data_dictionary: Dict) -> Dict[Any, Any]:
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"""
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Standardize all data in the data_dictionary according to the training dataset
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:params:
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:data_dictionary: dictionary containing the cleaned and split training/test data/labels
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:returns:
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:data_dictionary: updated dictionary with standardized values.
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"""
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# standardize the data by training stats
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train_mean = data_dictionary["train_features"].mean()
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train_std = data_dictionary["train_features"].std()
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data_dictionary["train_features"] = (
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data_dictionary["train_features"] - train_mean
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) / train_std
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data_dictionary["test_features"] = (
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data_dictionary["test_features"] - train_mean
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) / train_std
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train_labels_std = data_dictionary["train_labels"].std()
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train_labels_mean = data_dictionary["train_labels"].mean()
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data_dictionary["train_labels"] = (
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data_dictionary["train_labels"] - train_labels_mean
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) / train_labels_std
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data_dictionary["test_labels"] = (
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data_dictionary["test_labels"] - train_labels_mean
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) / train_labels_std
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for item in train_std.keys():
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self.data[item + "_std"] = train_std[item]
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self.data[item + "_mean"] = train_mean[item]
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self.data["labels_std"] = train_labels_std
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self.data["labels_mean"] = train_labels_mean
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return data_dictionary
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def standardize_data_from_metadata(self, df: DataFrame) -> DataFrame:
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"""
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Standardizes a set of data using the mean and standard deviation from
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the associated training data.
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:params:
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:df: Dataframe to be standardized
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"""
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for item in df.keys():
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df[item] = (df[item] - self.data[item + "_mean"]) / self.data[item + "_std"]
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return df
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def split_timerange(
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self, tr: str, train_split: int = 28, bt_split: int = 7
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) -> Tuple[list, list]:
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"""
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Function which takes a single time range (tr) and splits it
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into sub timeranges to train and backtest on based on user input
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tr: str, full timerange to train on
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train_split: the period length for the each training (days). Specified in user
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configuration file
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bt_split: the backtesting length (dats). Specified in user configuration file
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"""
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train_period = train_split * SECONDS_IN_DAY
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bt_period = bt_split * SECONDS_IN_DAY
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full_timerange = TimeRange.parse_timerange(tr)
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config_timerange = TimeRange.parse_timerange(self.config["timerange"])
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timerange_train = copy.deepcopy(full_timerange)
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timerange_backtest = copy.deepcopy(full_timerange)
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tr_training_list = []
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tr_backtesting_list = []
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first = True
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# within_config_timerange = True
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while True:
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if not first:
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timerange_train.startts = timerange_train.startts + bt_period
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timerange_train.stopts = timerange_train.startts + train_period
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# make sure we finish with a full backtest
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# if timerange_train.stopts > config_timerange.stopts - bt_period:
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# within_config_timerange = False
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# timerange_train.stopts = config_timerange.stopts - bt_period
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# # if a full training period doesnt fit, we stop
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# if timerange_train.stopts > full_timerange.stopts:
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# break
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first = False
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start = datetime.datetime.utcfromtimestamp(timerange_train.startts)
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stop = datetime.datetime.utcfromtimestamp(timerange_train.stopts)
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tr_training_list.append(start.strftime("%Y%m%d") + "-" + stop.strftime("%Y%m%d"))
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# associated backtest period
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timerange_backtest.startts = timerange_train.stopts
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if timerange_backtest.stopts > config_timerange.stopts:
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timerange_backtest.stopts = config_timerange.stopts
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else:
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timerange_backtest.stopts = timerange_backtest.startts + bt_period
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start = datetime.datetime.utcfromtimestamp(timerange_backtest.startts)
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stop = datetime.datetime.utcfromtimestamp(timerange_backtest.stopts)
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tr_backtesting_list.append(start.strftime("%Y%m%d") + "-" + stop.strftime("%Y%m%d"))
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# ensure we are predicting on exactly same amount of data as requested by user defined
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# --timerange
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if timerange_backtest.stopts == config_timerange.stopts:
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break
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print(tr_training_list, tr_backtesting_list)
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return tr_training_list, tr_backtesting_list
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def slice_dataframe(self, tr: str, df: DataFrame) -> DataFrame:
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"""
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Given a full dataframe, extract the user desired window
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:params:
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:tr: timerange string that we wish to extract from df
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:df: Dataframe containing all candles to run the entire backtest. Here
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it is sliced down to just the present training period.
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"""
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timerange = TimeRange.parse_timerange(tr)
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start = datetime.datetime.fromtimestamp(timerange.startts, tz=datetime.timezone.utc)
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stop = datetime.datetime.fromtimestamp(timerange.stopts, tz=datetime.timezone.utc)
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df = df.loc[df["date"] >= start, :]
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df = df.loc[df["date"] <= stop, :]
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return df
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def principal_component_analysis(self) -> None:
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"""
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Performs Principal Component Analysis on the data for dimensionality reduction
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and outlier detection (see self.remove_outliers())
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No parameters or returns, it acts on the data_dictionary held by the DataHandler.
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"""
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from sklearn.decomposition import PCA # avoid importing if we dont need it
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n_components = self.data_dictionary["train_features"].shape[1]
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pca = PCA(n_components=n_components)
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pca = pca.fit(self.data_dictionary["train_features"])
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n_keep_components = np.argmin(pca.explained_variance_ratio_.cumsum() < 0.999)
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pca2 = PCA(n_components=n_keep_components)
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self.data["n_kept_components"] = n_keep_components
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pca2 = pca2.fit(self.data_dictionary["train_features"])
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logger.info("reduced feature dimension by %s", n_components - n_keep_components)
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logger.info("explained variance %f", np.sum(pca2.explained_variance_ratio_))
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train_components = pca2.transform(self.data_dictionary["train_features"])
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test_components = pca2.transform(self.data_dictionary["test_features"])
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self.data_dictionary["train_features"] = pd.DataFrame(
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data=train_components,
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columns=["PC" + str(i) for i in range(0, n_keep_components)],
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index=self.data_dictionary["train_features"].index,
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)
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self.data_dictionary["test_features"] = pd.DataFrame(
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data=test_components,
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columns=["PC" + str(i) for i in range(0, n_keep_components)],
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index=self.data_dictionary["test_features"].index,
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)
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self.data["n_kept_components"] = n_keep_components
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self.pca = pca2
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if not self.model_path.is_dir():
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self.model_path.mkdir(parents=True, exist_ok=True)
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pk.dump(pca2, open(self.model_path / str(self.model_filename + "_pca_object.pkl"), "wb"))
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return None
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def compute_distances(self) -> float:
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logger.info("computing average mean distance for all training points")
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pairwise = pairwise_distances(self.data_dictionary["train_features"], n_jobs=-1)
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avg_mean_dist = pairwise.mean(axis=1).mean()
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logger.info("avg_mean_dist %s", avg_mean_dist)
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return avg_mean_dist
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def remove_outliers(self, predict: bool) -> None:
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"""
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Remove data that looks like an outlier based on the distribution of each
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variable.
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:params:
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:predict: boolean which tells the function if this is prediction data or
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training data coming in.
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"""
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lower_quantile = self.data_dictionary["train_features"].quantile(0.001)
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upper_quantile = self.data_dictionary["train_features"].quantile(0.999)
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if predict:
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df = self.data_dictionary["prediction_features"][
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(self.data_dictionary["prediction_features"] < upper_quantile)
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& (self.data_dictionary["prediction_features"] > lower_quantile)
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]
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drop_index = pd.isnull(df).any(1)
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self.data_dictionary["prediction_features"].fillna(0, inplace=True)
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drop_index = ~drop_index
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do_predict = np.array(drop_index.replace(True, 1).replace(False, 0))
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logger.info(
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"remove_outliers() tossed %s predictions",
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len(do_predict) - do_predict.sum(),
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)
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self.do_predict += do_predict
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self.do_predict -= 1
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else:
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filter_train_df = self.data_dictionary["train_features"][
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(self.data_dictionary["train_features"] < upper_quantile)
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& (self.data_dictionary["train_features"] > lower_quantile)
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]
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drop_index = pd.isnull(filter_train_df).any(1)
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drop_index = drop_index.replace(True, 1).replace(False, 0)
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self.data_dictionary["train_features"] = self.data_dictionary["train_features"][
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(drop_index == 0)
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]
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self.data_dictionary["train_labels"] = self.data_dictionary["train_labels"][
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(drop_index == 0)
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]
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self.data_dictionary["train_weights"] = self.data_dictionary["train_weights"][
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(drop_index == 0)
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]
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# do the same for the test data
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filter_test_df = self.data_dictionary["test_features"][
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(self.data_dictionary["test_features"] < upper_quantile)
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& (self.data_dictionary["test_features"] > lower_quantile)
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]
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drop_index = pd.isnull(filter_test_df).any(1)
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drop_index = drop_index.replace(True, 1).replace(False, 0)
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self.data_dictionary["test_labels"] = self.data_dictionary["test_labels"][
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(drop_index == 0)
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]
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self.data_dictionary["test_features"] = self.data_dictionary["test_features"][
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(drop_index == 0)
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]
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self.data_dictionary["test_weights"] = self.data_dictionary["test_weights"][
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(drop_index == 0)
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]
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return
|
|
|
|
def build_feature_list(self, config: dict) -> list:
|
|
"""
|
|
Build the list of features that will be used to filter
|
|
the full dataframe. Feature list is construced from the
|
|
user configuration file.
|
|
:params:
|
|
:config: Canonical freqtrade config file containing all
|
|
user defined input in config['freqai] dictionary.
|
|
"""
|
|
features = []
|
|
for tf in config["freqai"]["timeframes"]:
|
|
for ft in config["freqai"]["base_features"]:
|
|
for n in range(config["freqai"]["feature_parameters"]["shift"] + 1):
|
|
shift = ""
|
|
if n > 0:
|
|
shift = "_shift-" + str(n)
|
|
features.append(ft + shift + "_" + tf)
|
|
for p in config["freqai"]["corr_pairlist"]:
|
|
features.append(p.split("/")[0] + "-" + ft + shift + "_" + tf)
|
|
|
|
logger.info("number of features %s", len(features))
|
|
return features
|
|
|
|
def check_if_pred_in_training_spaces(self) -> None:
|
|
"""
|
|
Compares the distance from each prediction point to each training data
|
|
point. It uses this information to estimate a Dissimilarity Index (DI)
|
|
and avoid making predictions on any points that are too far away
|
|
from the training data set.
|
|
"""
|
|
|
|
distance = pairwise_distances(
|
|
self.data_dictionary["train_features"],
|
|
self.data_dictionary["prediction_features"],
|
|
n_jobs=-1,
|
|
)
|
|
|
|
do_predict = np.where(
|
|
distance.min(axis=0) / self.data["avg_mean_dist"]
|
|
< self.config["freqai"]["feature_parameters"]["DI_threshold"],
|
|
1,
|
|
0,
|
|
)
|
|
|
|
logger.info(
|
|
"Distance checker tossed %s predictions for being too far from training data",
|
|
len(do_predict) - do_predict.sum(),
|
|
)
|
|
|
|
self.do_predict += do_predict
|
|
self.do_predict -= 1
|
|
|
|
def set_weights_higher_recent(self, num_weights: int) -> int:
|
|
"""
|
|
Set weights so that recent data is more heavily weighted during
|
|
training than older data.
|
|
"""
|
|
weights = np.zeros(num_weights)
|
|
for i in range(1, len(weights)):
|
|
weights[len(weights) - i] = np.exp(
|
|
-i / (self.config["freqai"]["feature_parameters"]["weight_factor"] * num_weights)
|
|
)
|
|
return weights
|
|
|
|
def append_predictions(self, predictions, do_predict, len_dataframe):
|
|
"""
|
|
Append backtest prediction from current backtest period to all previous periods
|
|
"""
|
|
|
|
ones = np.ones(len_dataframe)
|
|
s_mean, s_std = ones * self.data["s_mean"], ones * self.data["s_std"]
|
|
|
|
self.predictions = np.append(self.predictions, predictions)
|
|
self.do_predict = np.append(self.do_predict, do_predict)
|
|
self.target_mean = np.append(self.target_mean, s_mean)
|
|
self.target_std = np.append(self.target_std, s_std)
|
|
|
|
return
|
|
|
|
def fill_predictions(self, len_dataframe):
|
|
"""
|
|
Back fill values to before the backtesting range so that the dataframe matches size
|
|
when it goes back to the strategy. These rows are not included in the backtest.
|
|
"""
|
|
|
|
filler = np.zeros(len_dataframe - len(self.predictions)) # startup_candle_count
|
|
self.predictions = np.append(filler, self.predictions)
|
|
self.do_predict = np.append(filler, self.do_predict)
|
|
self.target_mean = np.append(filler, self.target_mean)
|
|
self.target_std = np.append(filler, self.target_std)
|
|
|
|
return
|
|
|
|
def create_fulltimerange(self, backtest_tr: str, backtest_period: int) -> str:
|
|
backtest_timerange = TimeRange.parse_timerange(backtest_tr)
|
|
|
|
backtest_timerange.startts = backtest_timerange.startts - backtest_period * SECONDS_IN_DAY
|
|
start = datetime.datetime.utcfromtimestamp(backtest_timerange.startts)
|
|
stop = datetime.datetime.utcfromtimestamp(backtest_timerange.stopts)
|
|
full_timerange = start.strftime("%Y%m%d") + "-" + stop.strftime("%Y%m%d")
|
|
|
|
self.full_path = Path(
|
|
self.config["user_data_dir"]
|
|
/ "models"
|
|
/ str(full_timerange + self.freqai_config["identifier"])
|
|
)
|
|
|
|
if not self.full_path.is_dir():
|
|
self.full_path.mkdir(parents=True, exist_ok=True)
|
|
shutil.copy(
|
|
Path(self.config["config_files"][0]).name,
|
|
Path(self.full_path / self.config["config_files"][0]),
|
|
)
|
|
|
|
return full_timerange
|
|
|
|
def np_encoder(self, object):
|
|
if isinstance(object, np.generic):
|
|
return object.item()
|