mirror of
https://github.com/webclinic017/drift.git
synced 2026-07-28 19:27:47 +00:00
Mark Aron Szulyovszky
b6cd6b14fe
* feat(Config): feature extractors are enabled one-by-one with a bool, added previous model to model.fit() * fix(Sweep): removed unused `other_features` parameter that fails sweep * feat(Config): using preset names for defining feature extractors again * fix(Tests): fixed model stub classes
77 lines
2.7 KiB
Python
77 lines
2.7 KiB
Python
import pandas as pd
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from models.base import Model
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import numpy as np
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from utils.helpers import get_first_valid_return_index
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from sklearn.base import clone
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def walk_forward_train_test(
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model_name: str,
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model: Model,
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X: pd.DataFrame,
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y: pd.Series,
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target_returns: pd.Series,
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expanding_window: bool,
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window_size: int,
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retrain_every: int,
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scaler,
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) -> tuple[pd.Series, pd.Series]:
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assert len(X) == len(y)
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predictions = pd.Series(index=y.index).rename(model_name)
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models = pd.Series(index=y.index).rename(model_name)
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first_nonzero_return = max(get_first_valid_return_index(target_returns), get_first_valid_return_index(X.iloc[:,0]))
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train_from = first_nonzero_return + window_size + 1
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train_till = len(y)
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iterations_before_retrain = 0
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if model.only_column is not None:
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X = X[[column for column in X.columns if model.only_column in column]]
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is_scaling_on = scaler is not None and model.data_scaling == 'scaled'
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if is_scaling_on:
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scaler = clone(scaler)
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for index in range(train_from, train_till):
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if iterations_before_retrain <= 0 or pd.isna(models[index-1]):
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if expanding_window:
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train_window_start = first_nonzero_return
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else:
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train_window_start = index - window_size - 1
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train_window_end = index - 1
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if is_scaling_on:
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# First we need to fit on the expanding window data slice
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# This is our only way to avoid lookahead bia
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X_expanding_window = X[first_nonzero_return:train_window_end]
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scaler.fit(X_expanding_window.values)
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X_slice = X[train_window_start:train_window_end]
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y_slice = y[train_window_start:train_window_end]
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if is_scaling_on:
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X_slice = scaler.transform(X_slice.values)
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else:
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X_slice = X_slice.to_numpy()
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current_model = model.clone()
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current_model.fit(X_slice, y_slice.to_numpy(), models[index-1])
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iterations_before_retrain = retrain_every
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else:
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current_model = models[index-1]
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models[index] = current_model
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next_timestep = X.iloc[index].to_numpy().reshape(1, -1)
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if is_scaling_on:
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next_timestep = scaler.transform(next_timestep)
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prediction = current_model.predict(next_timestep).item()
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predictions[index] = prediction
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iterations_before_retrain -= 1
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return models, predictions
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