import copy
import logging
import shutil
from datetime import datetime, timezone
from math import cos, sin
from pathlib import Path
from typing import Any, Dict, List, Tuple
import numpy as np
import numpy.typing as npt
import pandas as pd
from pandas import DataFrame
from scipy import stats
from sklearn import linear_model
from sklearn.cluster import DBSCAN
from sklearn.metrics.pairwise import pairwise_distances
from sklearn.model_selection import train_test_split
from sklearn.neighbors import NearestNeighbors
from freqtrade.configuration import TimeRange
from freqtrade.exceptions import OperationalException
from freqtrade.exchange import timeframe_to_seconds
from freqtrade.strategy.interface import IStrategy
SECONDS_IN_DAY = 86400
SECONDS_IN_HOUR = 3600
logger = logging.getLogger(__name__)
class FreqaiDataKitchen:
"""
Class designed to analyze data for a single pair. Employed by the IFreqaiModel class.
Functionalities include holding, saving, loading, and analyzing the data.
This object is not persistent, it is reinstantiated for each coin, each time the coin
model needs to be inferenced or trained.
Record of contribution:
FreqAI was developed by a group of individuals who all contributed specific skillsets to the
project.
Conception and software development:
Robert Caulk @robcaulk
Theoretical brainstorming:
Elin Törnquist @th0rntwig
Code review, software architecture brainstorming:
@xmatthias
Beta testing and bug reporting:
@bloodhunter4rc, Salah Lamkadem @ikonx, @ken11o2, @longyu, @paranoidandy, @smidelis, @smarm
Juha Nykänen @suikula, Wagner Costa @wagnercosta, Johan Vlugt @Jooopieeert
"""
def __init__(
self,
config: Dict[str, Any],
live: bool = False,
pair: str = "",
):
self.data: Dict[str, Any] = {}
self.data_dictionary: Dict[str, DataFrame] = {}
self.config = config
self.freqai_config: Dict[str, Any] = config["freqai"]
self.full_df: DataFrame = DataFrame()
self.append_df: DataFrame = DataFrame()
self.data_path = Path()
self.label_list: List = []
self.training_features_list: List = []
self.model_filename: str = ""
self.backtesting_results_path = Path()
self.backtest_predictions_folder: str = "backtesting_predictions"
self.live = live
self.pair = pair
self.svm_model: linear_model.SGDOneClassSVM = None
self.keras: bool = self.freqai_config.get("keras", False)
self.set_all_pairs()
if not self.live:
if not self.config["timerange"]:
raise OperationalException(
'Please pass --timerange if you intend to use FreqAI for backtesting.')
self.full_timerange = self.create_fulltimerange(
self.config["timerange"], self.freqai_config.get("train_period_days", 0)
)
(self.training_timeranges, self.backtesting_timeranges) = self.split_timerange(
self.full_timerange,
config["freqai"]["train_period_days"],
config["freqai"]["backtest_period_days"],
)
self.data['extra_returns_per_train'] = self.freqai_config.get('extra_returns_per_train', {})
self.thread_count = self.freqai_config.get("data_kitchen_thread_count", -1)
self.train_dates: DataFrame = pd.DataFrame()
self.unique_classes: Dict[str, list] = {}
self.unique_class_list: list = []
def set_paths(
self,
pair: str,
trained_timestamp: int = None,
) -> None:
"""
Set the paths to the data for the present coin/botloop
:params:
metadata: dict = strategy furnished pair metadata
trained_timestamp: int = timestamp of most recent training
"""
self.full_path = Path(
self.config["user_data_dir"] / "models" / str(self.freqai_config.get("identifier"))
)
self.data_path = Path(
self.full_path
/ f"sub-train-{pair.split('/')[0]}_{trained_timestamp}"
)
return
def make_train_test_datasets(
self, filtered_dataframe: DataFrame, labels: DataFrame
) -> Dict[Any, Any]:
"""
Given the dataframe for the full history for training, split the data into
training and test data according to user specified parameters in configuration
file.
:filtered_dataframe: cleaned dataframe ready to be split.
:labels: cleaned labels ready to be split.
"""
feat_dict = self.freqai_config["feature_parameters"]
weights: npt.ArrayLike
if feat_dict.get("weight_factor", 0) > 0:
weights = self.set_weights_higher_recent(len(filtered_dataframe))
else:
weights = np.ones(len(filtered_dataframe))
if feat_dict.get("stratify_training_data", 0) > 0:
stratification = np.zeros(len(filtered_dataframe))
for i in range(1, len(stratification)):
if i % feat_dict.get("stratify_training_data", 0) == 0:
stratification[i] = 1
else:
stratification = None
if self.freqai_config.get('data_split_parameters', {}).get('test_size', 0.1) != 0:
(
train_features,
test_features,
train_labels,
test_labels,
train_weights,
test_weights,
) = train_test_split(
filtered_dataframe[: filtered_dataframe.shape[0]],
labels,
weights,
stratify=stratification,
**self.config["freqai"]["data_split_parameters"],
)
else:
test_labels = np.zeros(2)
test_features = pd.DataFrame()
test_weights = np.zeros(2)
train_features = filtered_dataframe
train_labels = labels
train_weights = weights
# Simplest way to reverse the order of training and test data:
if self.freqai_config['feature_parameters'].get('reverse_train_test_order', False):
return self.build_data_dictionary(
test_features, train_features, test_labels,
train_labels, test_weights, train_weights
)
else:
return self.build_data_dictionary(
train_features, test_features, train_labels,
test_labels, train_weights, test_weights
)
def filter_features(
self,
unfiltered_df: DataFrame,
training_feature_list: List,
label_list: List = list(),
training_filter: bool = True,
) -> Tuple[DataFrame, DataFrame]:
"""
Filter the unfiltered dataframe to extract the user requested features/labels and properly
remove all NaNs. Any row with a NaN is removed from training dataset or replaced with
0s in the prediction dataset. However, prediction dataset do_predict will reflect any
row that had a NaN and will shield user from that prediction.
:params:
:unfiltered_df: the full dataframe for the present training period
:training_feature_list: list, the training feature list constructed by
self.build_feature_list() according to user specified parameters in the configuration file.
:labels: the labels for the dataset
:training_filter: boolean which lets the function know if it is training data or
prediction data to be filtered.
:returns:
:filtered_df: dataframe cleaned of NaNs and only containing the user
requested feature set.
:labels: labels cleaned of NaNs.
"""
filtered_df = unfiltered_df.filter(training_feature_list, axis=1)
filtered_df = filtered_df.replace([np.inf, -np.inf], np.nan)
drop_index = pd.isnull(filtered_df).any(1) # get the rows that have NaNs,
drop_index = drop_index.replace(True, 1).replace(False, 0) # pep8 requirement.
if (training_filter):
const_cols = list((filtered_df.nunique() == 1).loc[lambda x: x].index)
if const_cols:
filtered_df = filtered_df.filter(filtered_df.columns.difference(const_cols))
logger.warning(f"Removed features {const_cols} with constant values.")
# we don't care about total row number (total no. datapoints) in training, we only care
# about removing any row with NaNs
# if labels has multiple columns (user wants to train multiple modelEs), we detect here
labels = unfiltered_df.filter(label_list, axis=1)
drop_index_labels = pd.isnull(labels).any(1)
drop_index_labels = drop_index_labels.replace(True, 1).replace(False, 0)
dates = unfiltered_df['date']
filtered_df = filtered_df[
(drop_index == 0) & (drop_index_labels == 0)
] # dropping values
labels = labels[
(drop_index == 0) & (drop_index_labels == 0)
] # assuming the labels depend entirely on the dataframe here.
self.train_dates = dates[
(drop_index == 0) & (drop_index_labels == 0)
]
logger.info(
f"dropped {len(unfiltered_df) - len(filtered_df)} training points"
f" due to NaNs in populated dataset {len(unfiltered_df)}."
)
if (1 - len(filtered_df) / len(unfiltered_df)) > 0.1 and self.live:
worst_indicator = str(unfiltered_df.count().idxmin())
logger.warning(
f" {(1 - len(filtered_df)/len(unfiltered_df)) * 100:.0f} percent "
" of training data dropped due to NaNs, model may perform inconsistent "
f"with expectations. Verify {worst_indicator}"
)
self.data["filter_drop_index_training"] = drop_index
else:
# we are backtesting so we need to preserve row number to send back to strategy,
# so now we use do_predict to avoid any prediction based on a NaN
drop_index = pd.isnull(filtered_df).any(1)
self.data["filter_drop_index_prediction"] = drop_index
filtered_df.fillna(0, inplace=True)
# replacing all NaNs with zeros to avoid issues in 'prediction', but any prediction
# that was based on a single NaN is ultimately protected from buys with do_predict
drop_index = ~drop_index
self.do_predict = np.array(drop_index.replace(True, 1).replace(False, 0))
if (len(self.do_predict) - self.do_predict.sum()) > 0:
logger.info(
"dropped %s of %s prediction data points due to NaNs.",
len(self.do_predict) - self.do_predict.sum(),
len(filtered_df),
)
labels = []
return filtered_df, labels
def build_data_dictionary(
self,
train_df: DataFrame,
test_df: DataFrame,
train_labels: DataFrame,
test_labels: DataFrame,
train_weights: Any,
test_weights: Any,
) -> Dict:
self.data_dictionary = {
"train_features": train_df,
"test_features": test_df,
"train_labels": train_labels,
"test_labels": test_labels,
"train_weights": train_weights,
"test_weights": test_weights,
"train_dates": self.train_dates
}
return self.data_dictionary
def normalize_data(self, data_dictionary: Dict) -> Dict[Any, Any]:
"""
Normalize all data in the data_dictionary according to the training dataset
:params:
:data_dictionary: dictionary containing the cleaned and split training/test data/labels
:returns:
:data_dictionary: updated dictionary with standardized values.
"""
# standardize the data by training stats
train_max = data_dictionary["train_features"].max()
train_min = data_dictionary["train_features"].min()
data_dictionary["train_features"] = (
2 * (data_dictionary["train_features"] - train_min) / (train_max - train_min) - 1
)
data_dictionary["test_features"] = (
2 * (data_dictionary["test_features"] - train_min) / (train_max - train_min) - 1
)
for item in train_max.keys():
self.data[item + "_max"] = train_max[item]
self.data[item + "_min"] = train_min[item]
for item in data_dictionary["train_labels"].keys():
if data_dictionary["train_labels"][item].dtype == object:
continue
train_labels_max = data_dictionary["train_labels"][item].max()
train_labels_min = data_dictionary["train_labels"][item].min()
data_dictionary["train_labels"][item] = (
2
* (data_dictionary["train_labels"][item] - train_labels_min)
/ (train_labels_max - train_labels_min)
- 1
)
if self.freqai_config.get('data_split_parameters', {}).get('test_size', 0.1) != 0:
data_dictionary["test_labels"][item] = (
2
* (data_dictionary["test_labels"][item] - train_labels_min)
/ (train_labels_max - train_labels_min)
- 1
)
self.data[f"{item}_max"] = train_labels_max
self.data[f"{item}_min"] = train_labels_min
return data_dictionary
def normalize_single_dataframe(self, df: DataFrame) -> DataFrame:
train_max = df.max()
train_min = df.min()
df = (
2 * (df - train_min) / (train_max - train_min) - 1
)
for item in train_max.keys():
self.data[item + "_max"] = train_max[item]
self.data[item + "_min"] = train_min[item]
return df
def normalize_data_from_metadata(self, df: DataFrame) -> DataFrame:
"""
Normalize a set of data using the mean and standard deviation from
the associated training data.
:param df: Dataframe to be standardized
"""
for item in df.keys():
df[item] = (
2
* (df[item] - self.data[f"{item}_min"])
/ (self.data[f"{item}_max"] - self.data[f"{item}_min"])
- 1
)
return df
def denormalize_labels_from_metadata(self, df: DataFrame) -> DataFrame:
"""
Denormalize a set of data using the mean and standard deviation from
the associated training data.
:param df: Dataframe of predictions to be denormalized
"""
for label in df.columns:
if df[label].dtype == object or label in self.unique_class_list:
continue
df[label] = (
(df[label] + 1)
* (self.data[f"{label}_max"] - self.data[f"{label}_min"])
/ 2
) + self.data[f"{label}_min"]
return df
def split_timerange(
self, tr: str, train_split: int = 28, bt_split: float = 7
) -> Tuple[list, list]:
"""
Function which takes a single time range (tr) and splits it
into sub timeranges to train and backtest on based on user input
tr: str, full timerange to train on
train_split: the period length for the each training (days). Specified in user
configuration file
bt_split: the backtesting length (days). Specified in user configuration file
"""
if not isinstance(train_split, int) or train_split < 1:
raise OperationalException(
f"train_period_days must be an integer greater than 0. Got {train_split}."
)
train_period_days = train_split * SECONDS_IN_DAY
bt_period = bt_split * SECONDS_IN_DAY
full_timerange = TimeRange.parse_timerange(tr)
config_timerange = TimeRange.parse_timerange(self.config["timerange"])
if config_timerange.stopts == 0:
config_timerange.stopts = int(
datetime.now(tz=timezone.utc).timestamp()
)
timerange_train = copy.deepcopy(full_timerange)
timerange_backtest = copy.deepcopy(full_timerange)
tr_training_list = []
tr_backtesting_list = []
tr_training_list_timerange = []
tr_backtesting_list_timerange = []
first = True
while True:
if not first:
timerange_train.startts = timerange_train.startts + int(bt_period)
timerange_train.stopts = timerange_train.startts + train_period_days
first = False
start = datetime.fromtimestamp(timerange_train.startts, tz=timezone.utc)
stop = datetime.fromtimestamp(timerange_train.stopts, tz=timezone.utc)
tr_training_list.append(start.strftime("%Y%m%d") + "-" + stop.strftime("%Y%m%d"))
tr_training_list_timerange.append(copy.deepcopy(timerange_train))
# associated backtest period
timerange_backtest.startts = timerange_train.stopts
timerange_backtest.stopts = timerange_backtest.startts + int(bt_period)
if timerange_backtest.stopts > config_timerange.stopts:
timerange_backtest.stopts = config_timerange.stopts
start = datetime.fromtimestamp(timerange_backtest.startts, tz=timezone.utc)
stop = datetime.fromtimestamp(timerange_backtest.stopts, tz=timezone.utc)
tr_backtesting_list.append(start.strftime("%Y%m%d") + "-" + stop.strftime("%Y%m%d"))
tr_backtesting_list_timerange.append(copy.deepcopy(timerange_backtest))
# ensure we are predicting on exactly same amount of data as requested by user defined
# --timerange
if timerange_backtest.stopts == config_timerange.stopts:
break
# print(tr_training_list, tr_backtesting_list)
return tr_training_list_timerange, tr_backtesting_list_timerange
def slice_dataframe(self, timerange: TimeRange, df: DataFrame) -> DataFrame:
"""
Given a full dataframe, extract the user desired window
:param tr: timerange string that we wish to extract from df
:param df: Dataframe containing all candles to run the entire backtest. Here
it is sliced down to just the present training period.
"""
start = datetime.fromtimestamp(timerange.startts, tz=timezone.utc)
stop = datetime.fromtimestamp(timerange.stopts, tz=timezone.utc)
df = df.loc[df["date"] >= start, :]
if not self.live:
df = df.loc[df["date"] < stop, :]
return df
def remove_training_from_backtesting(
self
) -> DataFrame:
"""
Function which takes the backtesting time range and
remove training data from dataframe, keeping only the
startup_candle_count candles
"""
startup_candle_count = self.config.get('startup_candle_count', 0)
tf = self.config['timeframe']
tr = self.config["timerange"]
backtesting_timerange = TimeRange.parse_timerange(tr)
if startup_candle_count > 0 and backtesting_timerange:
backtesting_timerange.subtract_start(timeframe_to_seconds(tf) * startup_candle_count)
start = datetime.fromtimestamp(backtesting_timerange.startts, tz=timezone.utc)
df = self.return_dataframe
df = df.loc[df["date"] >= start, :]
return df
def principal_component_analysis(self) -> None:
"""
Performs Principal Component Analysis on the data for dimensionality reduction
and outlier detection (see self.remove_outliers())
No parameters or returns, it acts on the data_dictionary held by the DataHandler.
"""
from sklearn.decomposition import PCA # avoid importing if we dont need it
pca = PCA(0.999)
pca = pca.fit(self.data_dictionary["train_features"])
n_keep_components = pca.n_components_
self.data["n_kept_components"] = n_keep_components
n_components = self.data_dictionary["train_features"].shape[1]
logger.info("reduced feature dimension by %s", n_components - n_keep_components)
logger.info("explained variance %f", np.sum(pca.explained_variance_ratio_))
train_components = pca.transform(self.data_dictionary["train_features"])
self.data_dictionary["train_features"] = pd.DataFrame(
data=train_components,
columns=["PC" + str(i) for i in range(0, n_keep_components)],
index=self.data_dictionary["train_features"].index,
)
# normalsing transformed training features
self.data_dictionary["train_features"] = self.normalize_single_dataframe(
self.data_dictionary["train_features"])
# keeping a copy of the non-transformed features so we can check for errors during
# model load from disk
self.data["training_features_list_raw"] = copy.deepcopy(self.training_features_list)
self.training_features_list = self.data_dictionary["train_features"].columns
if self.freqai_config.get('data_split_parameters', {}).get('test_size', 0.1) != 0:
test_components = pca.transform(self.data_dictionary["test_features"])
self.data_dictionary["test_features"] = pd.DataFrame(
data=test_components,
columns=["PC" + str(i) for i in range(0, n_keep_components)],
index=self.data_dictionary["test_features"].index,
)
# normalise transformed test feature to transformed training features
self.data_dictionary["test_features"] = self.normalize_data_from_metadata(
self.data_dictionary["test_features"])
self.data["n_kept_components"] = n_keep_components
self.pca = pca
logger.info(f"PCA reduced total features from {n_components} to {n_keep_components}")
if not self.data_path.is_dir():
self.data_path.mkdir(parents=True, exist_ok=True)
return None
def pca_transform(self, filtered_dataframe: DataFrame) -> None:
"""
Use an existing pca transform to transform data into components
:params:
filtered_dataframe: DataFrame = the cleaned dataframe
"""
pca_components = self.pca.transform(filtered_dataframe)
self.data_dictionary["prediction_features"] = pd.DataFrame(
data=pca_components,
columns=["PC" + str(i) for i in range(0, self.data["n_kept_components"])],
index=filtered_dataframe.index,
)
# normalise transformed predictions to transformed training features
self.data_dictionary["prediction_features"] = self.normalize_data_from_metadata(
self.data_dictionary["prediction_features"])
def compute_distances(self) -> float:
"""
Compute distances between each training point and every other training
point. This metric defines the neighborhood of trained data and is used
for prediction confidence in the Dissimilarity Index
"""
# logger.info("computing average mean distance for all training points")
pairwise = pairwise_distances(
self.data_dictionary["train_features"], n_jobs=self.thread_count)
# remove the diagonal distances which are itself distances ~0
np.fill_diagonal(pairwise, np.NaN)
pairwise = pairwise.reshape(-1, 1)
avg_mean_dist = pairwise[~np.isnan(pairwise)].mean()
return avg_mean_dist
def get_outlier_percentage(self, dropped_pts: npt.NDArray) -> float:
"""
Check if more than X% of points werer dropped during outlier detection.
"""
outlier_protection_pct = self.freqai_config["feature_parameters"].get(
"outlier_protection_percentage", 30)
outlier_pct = (dropped_pts.sum() / len(dropped_pts)) * 100
if outlier_pct >= outlier_protection_pct:
return outlier_pct
else:
return 0.0
def use_SVM_to_remove_outliers(self, predict: bool) -> None:
"""
Build/inference a Support Vector Machine to detect outliers
in training data and prediction
:params:
predict: bool = If true, inference an existing SVM model, else construct one
"""
if self.keras:
logger.warning(
"SVM outlier removal not currently supported for Keras based models. "
"Skipping user requested function."
)
if predict:
self.do_predict = np.ones(len(self.data_dictionary["prediction_features"]))
return
if predict:
if not self.svm_model:
logger.warning("No svm model available for outlier removal")
return
y_pred = self.svm_model.predict(self.data_dictionary["prediction_features"])
do_predict = np.where(y_pred == -1, 0, y_pred)
if (len(do_predict) - do_predict.sum()) > 0:
logger.info(f"SVM tossed {len(do_predict) - do_predict.sum()} predictions.")
self.do_predict += do_predict
self.do_predict -= 1
else:
# use SGDOneClassSVM to increase speed?
svm_params = self.freqai_config["feature_parameters"].get(
"svm_params", {"shuffle": False, "nu": 0.1})
self.svm_model = linear_model.SGDOneClassSVM(**svm_params).fit(
self.data_dictionary["train_features"]
)
y_pred = self.svm_model.predict(self.data_dictionary["train_features"])
kept_points = np.where(y_pred == -1, 0, y_pred)
# keep_index = np.where(y_pred == 1)
outlier_pct = self.get_outlier_percentage(1 - kept_points)
if outlier_pct:
logger.warning(
f"SVM detected {outlier_pct:.2f}% of the points as outliers. "
f"Keeping original dataset."
)
self.svm_model = None
return
self.data_dictionary["train_features"] = self.data_dictionary["train_features"][
(y_pred == 1)
]
self.data_dictionary["train_labels"] = self.data_dictionary["train_labels"][
(y_pred == 1)
]
self.data_dictionary["train_weights"] = self.data_dictionary["train_weights"][
(y_pred == 1)
]
logger.info(
f"SVM tossed {len(y_pred) - kept_points.sum()}"
f" train points from {len(y_pred)} total points."
)
# same for test data
# TODO: This (and the part above) could be refactored into a separate function
# to reduce code duplication
if self.freqai_config['data_split_parameters'].get('test_size', 0.1) != 0:
y_pred = self.svm_model.predict(self.data_dictionary["test_features"])
kept_points = np.where(y_pred == -1, 0, y_pred)
self.data_dictionary["test_features"] = self.data_dictionary["test_features"][
(y_pred == 1)
]
self.data_dictionary["test_labels"] = self.data_dictionary["test_labels"][(
y_pred == 1)]
self.data_dictionary["test_weights"] = self.data_dictionary["test_weights"][
(y_pred == 1)
]
logger.info(
f"SVM tossed {len(y_pred) - kept_points.sum()}"
f" test points from {len(y_pred)} total points."
)
return
def use_DBSCAN_to_remove_outliers(self, predict: bool, eps=None) -> None:
"""
Use DBSCAN to cluster training data and remove "noisy" data (read outliers).
User controls this via the config param `DBSCAN_outlier_pct` which indicates the
pct of training data that they want to be considered outliers.
:params:
predict: bool = If False (training), iterate to find the best hyper parameters to match
user requested outlier percent target. If True (prediction), use the parameters
determined from the previous training to estimate if the current prediction point
is an outlier.
"""
if predict:
if not self.data['DBSCAN_eps']:
return
train_ft_df = self.data_dictionary['train_features']
pred_ft_df = self.data_dictionary['prediction_features']
num_preds = len(pred_ft_df)
df = pd.concat([train_ft_df, pred_ft_df], axis=0, ignore_index=True)
clustering = DBSCAN(eps=self.data['DBSCAN_eps'],
min_samples=self.data['DBSCAN_min_samples'],
n_jobs=self.thread_count
).fit(df)
do_predict = np.where(clustering.labels_[-num_preds:] == -1, 0, 1)
if (len(do_predict) - do_predict.sum()) > 0:
logger.info(f"DBSCAN tossed {len(do_predict) - do_predict.sum()} predictions")
self.do_predict += do_predict
self.do_predict -= 1
else:
def normalise_distances(distances):
normalised_distances = (distances - distances.min()) / \
(distances.max() - distances.min())
return normalised_distances
def rotate_point(origin, point, angle):
# rotate a point counterclockwise by a given angle (in radians)
# around a given origin
x = origin[0] + cos(angle) * (point[0] - origin[0]) - \
sin(angle) * (point[1] - origin[1])
y = origin[1] + sin(angle) * (point[0] - origin[0]) + \
cos(angle) * (point[1] - origin[1])
return (x, y)
MinPts = int(len(self.data_dictionary['train_features'].index) * 0.25)
# measure pairwise distances to nearest neighbours
neighbors = NearestNeighbors(
n_neighbors=MinPts, n_jobs=self.thread_count)
neighbors_fit = neighbors.fit(self.data_dictionary['train_features'])
distances, _ = neighbors_fit.kneighbors(self.data_dictionary['train_features'])
distances = np.sort(distances, axis=0).mean(axis=1)
normalised_distances = normalise_distances(distances)
x_range = np.linspace(0, 1, len(distances))
line = np.linspace(normalised_distances[0],
normalised_distances[-1], len(normalised_distances))
deflection = np.abs(normalised_distances - line)
max_deflection_loc = np.where(deflection == deflection.max())[0][0]
origin = x_range[max_deflection_loc], line[max_deflection_loc]
point = x_range[max_deflection_loc], normalised_distances[max_deflection_loc]
rot_angle = np.pi / 4
elbow_loc = rotate_point(origin, point, rot_angle)
epsilon = elbow_loc[1] * (distances[-1] - distances[0]) + distances[0]
clustering = DBSCAN(eps=epsilon, min_samples=MinPts,
n_jobs=int(self.thread_count)).fit(
self.data_dictionary['train_features']
)
logger.info(f'DBSCAN found eps of {epsilon:.2f}.')
self.data['DBSCAN_eps'] = epsilon
self.data['DBSCAN_min_samples'] = MinPts
dropped_points = np.where(clustering.labels_ == -1, 1, 0)
outlier_pct = self.get_outlier_percentage(dropped_points)
if outlier_pct:
logger.warning(
f"DBSCAN detected {outlier_pct:.2f}% of the points as outliers. "
f"Keeping original dataset."
)
self.data['DBSCAN_eps'] = 0
return
self.data_dictionary['train_features'] = self.data_dictionary['train_features'][
(clustering.labels_ != -1)
]
self.data_dictionary["train_labels"] = self.data_dictionary["train_labels"][
(clustering.labels_ != -1)
]
self.data_dictionary["train_weights"] = self.data_dictionary["train_weights"][
(clustering.labels_ != -1)
]
logger.info(
f"DBSCAN tossed {dropped_points.sum()}"
f" train points from {len(clustering.labels_)}"
)
return
def compute_inlier_metric(self, set_='train') -> None:
"""
Compute inlier metric from backwards distance distributions.
This metric defines how well features from a timepoint fit
into previous timepoints.
"""
no_prev_pts = self.freqai_config["feature_parameters"]["inlier_metric_window"]
if set_ == 'train':
compute_df = copy.deepcopy(self.data_dictionary['train_features'])
elif set_ == 'test':
compute_df = copy.deepcopy(self.data_dictionary['test_features'])
else:
compute_df = copy.deepcopy(self.data_dictionary['prediction_features'])
compute_df_reindexed = compute_df.reindex(
index=np.flip(compute_df.index)
)
pairwise = pd.DataFrame(
np.triu(
pairwise_distances(compute_df_reindexed, n_jobs=self.thread_count)
),
columns=compute_df_reindexed.index,
index=compute_df_reindexed.index
)
pairwise = pairwise.round(5)
column_labels = [
'{}{}'.format('d', i) for i in range(1, no_prev_pts + 1)
]
distances = pd.DataFrame(
columns=column_labels, index=compute_df.index
)
for index in compute_df.index[no_prev_pts:]:
current_row = pairwise.loc[[index]]
current_row_no_zeros = current_row.loc[
:, (current_row != 0).any(axis=0)
]
distances.loc[[index]] = current_row_no_zeros.iloc[
:, :no_prev_pts
]
distances = distances.replace([np.inf, -np.inf], np.nan)
drop_index = pd.isnull(distances).any(1)
distances = distances[drop_index == 0]
inliers = pd.DataFrame(index=distances.index)
for key in distances.keys():
current_distances = distances[key].dropna()
fit_params = stats.weibull_min.fit(current_distances)
quantiles = stats.weibull_min.cdf(current_distances, *fit_params)
df_inlier = pd.DataFrame(
{key: quantiles}, index=distances.index
)
inliers = pd.concat(
[inliers, df_inlier], axis=1
)
inlier_metric = pd.DataFrame(
data=inliers.sum(axis=1) / no_prev_pts,
columns=['inlier_metric'],
index=compute_df.index
)
inlier_metric = (2 * (inlier_metric - inlier_metric.min()) /
(inlier_metric.max() - inlier_metric.min()) - 1)
if set_ in ('train', 'test'):
inlier_metric = inlier_metric.iloc[no_prev_pts:]
compute_df = compute_df.iloc[no_prev_pts:]
self.remove_beginning_points_from_data_dict(set_, no_prev_pts)
self.data_dictionary[f'{set_}_features'] = pd.concat(
[compute_df, inlier_metric], axis=1)
else:
self.data_dictionary['prediction_features'] = pd.concat(
[compute_df, inlier_metric], axis=1)
self.data_dictionary['prediction_features'].fillna(0, inplace=True)
logger.info('Inlier metric computed and added to features.')
return None
def remove_beginning_points_from_data_dict(self, set_='train', no_prev_pts: int = 10):
features = self.data_dictionary[f'{set_}_features']
weights = self.data_dictionary[f'{set_}_weights']
labels = self.data_dictionary[f'{set_}_labels']
self.data_dictionary[f'{set_}_weights'] = weights[no_prev_pts:]
self.data_dictionary[f'{set_}_features'] = features.iloc[no_prev_pts:]
self.data_dictionary[f'{set_}_labels'] = labels.iloc[no_prev_pts:]
def add_noise_to_training_features(self) -> None:
"""
Add noise to train features to reduce the risk of overfitting.
"""
mu = 0 # no shift
sigma = self.freqai_config["feature_parameters"]["noise_standard_deviation"]
compute_df = self.data_dictionary['train_features']
noise = np.random.normal(mu, sigma, [compute_df.shape[0], compute_df.shape[1]])
self.data_dictionary['train_features'] += noise
return
def find_features(self, dataframe: DataFrame) -> None:
"""
Find features in the strategy provided dataframe
:param dataframe: DataFrame = strategy provided dataframe
:return:
features: list = the features to be used for training/prediction
"""
column_names = dataframe.columns
features = [c for c in column_names if "%" in c]
labels = [c for c in column_names if "&" in c]
if not features:
raise OperationalException("Could not find any features!")
self.training_features_list = features
self.label_list = labels
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=self.thread_count,
)
self.DI_values = distance.min(axis=0) / self.data["avg_mean_dist"]
do_predict = np.where(
self.DI_values < self.freqai_config["feature_parameters"]["DI_threshold"],
1,
0,
)
if (len(do_predict) - do_predict.sum()) > 0:
logger.info(
f"DI tossed {len(do_predict) - do_predict.sum()} predictions for "
"being too far from training data."
)
self.do_predict += do_predict
self.do_predict -= 1
def set_weights_higher_recent(self, num_weights: int) -> npt.ArrayLike:
"""
Set weights so that recent data is more heavily weighted during
training than older data.
"""
wfactor = self.config["freqai"]["feature_parameters"]["weight_factor"]
weights = np.exp(-np.arange(num_weights) / (wfactor * num_weights))[::-1]
return weights
def get_predictions_to_append(self, predictions: DataFrame,
do_predict: npt.ArrayLike) -> DataFrame:
"""
Get backtest prediction from current backtest period
"""
append_df = DataFrame()
for label in predictions.columns:
append_df[label] = predictions[label]
if append_df[label].dtype == object:
continue
append_df[f"{label}_mean"] = self.data["labels_mean"][label]
append_df[f"{label}_std"] = self.data["labels_std"][label]
append_df["do_predict"] = do_predict
if self.freqai_config["feature_parameters"].get("DI_threshold", 0) > 0:
append_df["DI_values"] = self.DI_values
return append_df
def append_predictions(self, append_df: DataFrame) -> None:
"""
Append backtest prediction from current backtest period to all previous periods
"""
if self.full_df.empty:
self.full_df = append_df
else:
self.full_df = pd.concat([self.full_df, append_df], axis=0)
def fill_predictions(self, 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.
"""
len_filler = len(dataframe) - len(self.full_df.index) # startup_candle_count
filler_df = pd.DataFrame(
np.zeros((len_filler, len(self.full_df.columns))), columns=self.full_df.columns
)
self.full_df = pd.concat([filler_df, self.full_df], axis=0, ignore_index=True)
to_keep = [col for col in dataframe.columns if not col.startswith("&")]
self.return_dataframe = pd.concat([dataframe[to_keep], self.full_df], axis=1)
self.return_dataframe = self.remove_training_from_backtesting()
self.full_df = DataFrame()
return
def create_fulltimerange(self, backtest_tr: str, backtest_period_days: int) -> str:
if not isinstance(backtest_period_days, int):
raise OperationalException("backtest_period_days must be an integer")
if backtest_period_days < 0:
raise OperationalException("backtest_period_days must be positive")
backtest_timerange = TimeRange.parse_timerange(backtest_tr)
if backtest_timerange.stopts == 0:
# typically open ended time ranges do work, however, there are some edge cases where
# it does not. accommodating these kinds of edge cases just to allow open-ended
# timerange is not high enough priority to warrant the effort. It is safer for now
# to simply ask user to add their end date
raise OperationalException("FreqAI backtesting does not allow open ended timeranges. "
"Please indicate the end date of your desired backtesting. "
"timerange.")
# backtest_timerange.stopts = int(
# datetime.now(tz=timezone.utc).timestamp()
# )
backtest_timerange.startts = (
backtest_timerange.startts - backtest_period_days * SECONDS_IN_DAY
)
start = datetime.fromtimestamp(backtest_timerange.startts, tz=timezone.utc)
stop = datetime.fromtimestamp(backtest_timerange.stopts, tz=timezone.utc)
full_timerange = start.strftime("%Y%m%d") + "-" + stop.strftime("%Y%m%d")
self.full_path = Path(
self.config["user_data_dir"] / "models" / f"{self.freqai_config['identifier']}"
)
config_path = Path(self.config["config_files"][0])
if not self.full_path.is_dir():
self.full_path.mkdir(parents=True, exist_ok=True)
shutil.copy(
config_path.resolve(),
Path(self.full_path / config_path.parts[-1]),
)
return full_timerange
def check_if_model_expired(self, trained_timestamp: int) -> bool:
"""
A model age checker to determine if the model is trustworthy based on user defined
`expiration_hours` in the configuration file.
:param trained_timestamp: int = The time of training for the most recent model.
:return:
bool = If the model is expired or not.
"""
time = datetime.now(tz=timezone.utc).timestamp()
elapsed_time = (time - trained_timestamp) / 3600 # hours
max_time = self.freqai_config.get("expiration_hours", 0)
if max_time > 0:
return elapsed_time > max_time
else:
return False
def check_if_new_training_required(
self, trained_timestamp: int
) -> Tuple[bool, TimeRange, TimeRange]:
time = datetime.now(tz=timezone.utc).timestamp()
trained_timerange = TimeRange()
data_load_timerange = TimeRange()
timeframes = self.freqai_config["feature_parameters"].get("include_timeframes")
max_tf_seconds = 0
for tf in timeframes:
secs = timeframe_to_seconds(tf)
if secs > max_tf_seconds:
max_tf_seconds = secs
# We notice that users like to use exotic indicators where
# they do not know the required timeperiod. Here we include a factor
# of safety by multiplying the user considered "max" by 2.
max_period = self.config.get('startup_candle_count', 20) * 2
additional_seconds = max_period * max_tf_seconds
if trained_timestamp != 0:
elapsed_time = (time - trained_timestamp) / SECONDS_IN_HOUR
retrain = elapsed_time > self.freqai_config.get("live_retrain_hours", 0)
if retrain:
trained_timerange.startts = int(
time - self.freqai_config.get("train_period_days", 0) * SECONDS_IN_DAY
)
trained_timerange.stopts = int(time)
# we want to load/populate indicators on more data than we plan to train on so
# because most of the indicators have a rolling timeperiod, and are thus NaNs
# unless they have data further back in time before the start of the train period
data_load_timerange.startts = int(
time
- self.freqai_config.get("train_period_days", 0) * SECONDS_IN_DAY
- additional_seconds
)
data_load_timerange.stopts = int(time)
else: # user passed no live_trained_timerange in config
trained_timerange.startts = int(
time - self.freqai_config.get("train_period_days", 0) * SECONDS_IN_DAY
)
trained_timerange.stopts = int(time)
data_load_timerange.startts = int(
time
- self.freqai_config.get("train_period_days", 0) * SECONDS_IN_DAY
- additional_seconds
)
data_load_timerange.stopts = int(time)
retrain = True
return retrain, trained_timerange, data_load_timerange
def set_new_model_names(self, pair: str, trained_timerange: TimeRange):
coin, _ = pair.split("/")
self.data_path = Path(
self.full_path
/ f"sub-train-{pair.split('/')[0]}_{int(trained_timerange.stopts)}"
)
self.model_filename = f"cb_{coin.lower()}_{int(trained_timerange.stopts)}"
def set_all_pairs(self) -> None:
self.all_pairs = copy.deepcopy(
self.freqai_config["feature_parameters"].get("include_corr_pairlist", [])
)
for pair in self.config.get("exchange", "").get("pair_whitelist"):
if pair not in self.all_pairs:
self.all_pairs.append(pair)
def use_strategy_to_populate_indicators(
self,
strategy: IStrategy,
corr_dataframes: dict = {},
base_dataframes: dict = {},
pair: str = "",
prediction_dataframe: DataFrame = pd.DataFrame(),
) -> DataFrame:
"""
Use the user defined strategy for populating indicators during
retrain
:params:
strategy: IStrategy = user defined strategy object
corr_dataframes: dict = dict containing the informative pair dataframes
(for user defined timeframes)
base_dataframes: dict = dict containing the current pair dataframes
(for user defined timeframes)
metadata: dict = strategy furnished pair metadata
:returns:
dataframe: DataFrame = dataframe containing populated indicators
"""
# for prediction dataframe creation, we let dataprovider handle everything in the strategy
# so we create empty dictionaries, which allows us to pass None to
# `populate_any_indicators()`. Signaling we want the dp to give us the live dataframe.
tfs = self.freqai_config["feature_parameters"].get("include_timeframes")
pairs = self.freqai_config["feature_parameters"].get("include_corr_pairlist", [])
if not prediction_dataframe.empty:
dataframe = prediction_dataframe.copy()
for tf in tfs:
base_dataframes[tf] = None
for p in pairs:
if p not in corr_dataframes:
corr_dataframes[p] = {}
corr_dataframes[p][tf] = None
else:
dataframe = base_dataframes[self.config["timeframe"]].copy()
sgi = False
for tf in tfs:
if tf == tfs[-1]:
sgi = True # doing this last allows user to use all tf raw prices in labels
dataframe = strategy.populate_any_indicators(
pair,
dataframe.copy(),
tf,
informative=base_dataframes[tf],
set_generalized_indicators=sgi
)
if pairs:
for i in pairs:
if pair in i:
continue # dont repeat anything from whitelist
dataframe = strategy.populate_any_indicators(
i,
dataframe.copy(),
tf,
informative=corr_dataframes[i][tf]
)
self.get_unique_classes_from_labels(dataframe)
return dataframe
def fit_labels(self) -> None:
"""
Fit the labels with a gaussian distribution
"""
import scipy as spy
self.data["labels_mean"], self.data["labels_std"] = {}, {}
for label in self.data_dictionary["train_labels"].columns:
if self.data_dictionary["train_labels"][label].dtype == object:
continue
f = spy.stats.norm.fit(self.data_dictionary["train_labels"][label])
self.data["labels_mean"][label], self.data["labels_std"][label] = f[0], f[1]
# incase targets are classifications
for label in self.unique_class_list:
self.data["labels_mean"][label], self.data["labels_std"][label] = 0, 0
return
def remove_features_from_df(self, dataframe: DataFrame) -> DataFrame:
"""
Remove the features from the dataframe before returning it to strategy. This keeps it
compact for Frequi purposes.
"""
to_keep = [
col for col in dataframe.columns if not col.startswith("%") or col.startswith("%%")
]
return dataframe[to_keep]
def get_unique_classes_from_labels(self, dataframe: DataFrame) -> None:
self.find_features(dataframe)
for key in self.label_list:
if dataframe[key].dtype == object:
self.unique_classes[key] = dataframe[key].dropna().unique()
if self.unique_classes:
for label in self.unique_classes:
self.unique_class_list += list(self.unique_classes[label])
def save_backtesting_prediction(
self, append_df: DataFrame
) -> None:
"""
Save prediction dataframe from backtesting to h5 file format
:param append_df: dataframe for backtesting period
"""
full_predictions_folder = Path(self.full_path / self.backtest_predictions_folder)
if not full_predictions_folder.is_dir():
full_predictions_folder.mkdir(parents=True, exist_ok=True)
append_df.to_hdf(self.backtesting_results_path, key='append_df', mode='w')
def get_backtesting_prediction(
self
) -> DataFrame:
"""
Get prediction dataframe from h5 file format
"""
append_df = pd.read_hdf(self.backtesting_results_path)
return append_df
def check_if_backtest_prediction_exists(
self
) -> bool:
"""
Check if a backtesting prediction already exists
:param dk: FreqaiDataKitchen
:return:
:boolean: whether the prediction file exists or not.
"""
path_to_predictionfile = Path(self.full_path /
self.backtest_predictions_folder /
f"{self.model_filename}_prediction.h5")
self.backtesting_results_path = path_to_predictionfile
file_exists = path_to_predictionfile.is_file()
if file_exists:
logger.info(f"Found backtesting prediction file at {path_to_predictionfile}")
else:
logger.info(
f"Could not find backtesting prediction file at {path_to_predictionfile}"
)
return file_exists