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Normalise PCA space

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This commit is contained in:
th0rntwig 2022-09-01 21:51:33 +02:00
parent f3c73189d5
commit 3f8400df10
1 changed files with 45 additions and 19 deletions
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56
freqtrade/freqai/data_kitchen.py
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@ -287,19 +287,26 @@ class FreqaiDataKitchen:
:returns:
:data_dictionary: updated dictionary with standardized values.
"""
df_train_features = data_dictionary["train_features"]
# 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
train_max = df_train_features.max()
train_min = df_train_features.min()
df_train_features = (
2 * (df_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():
if not [col for col in df_train_features.columns if col.startwith('PC')]:
self.data[item + "_max"] = train_max[item]
self.data[item + "_min"] = train_min[item]
else:
# if PCA is enabled and has transformed the training features
self.data[item + "_pca_max"] = train_max[item]
self.data[item + "_pca_min"] = train_min[item]
for item in data_dictionary["train_labels"].keys():
if data_dictionary["train_labels"][item].dtype == object:
@ -320,8 +327,14 @@ class FreqaiDataKitchen:
- 1
)
if not [col for col in df_train_features.columns if col.startwith('PC')]:
self.data[f"{item}_max"] = train_labels_max # .to_dict()
self.data[f"{item}_min"] = train_labels_min # .to_dict()
else:
# if PCA is enabled and has transformed the training features
self.data[f"{item}_pca_max"] = train_labels_max # .to_dict()
self.data[f"{item}_pca_min"] = train_labels_min # .to_dict()
return data_dictionary
def normalize_data_from_metadata(self, df: DataFrame) -> DataFrame:
@ -331,11 +344,17 @@ class FreqaiDataKitchen:
:param df: Dataframe to be standardized
"""
if not [col for col in df.columns if col.startwith('PC')]:
id_str = ''
else:
# if PCA is enabled
id_str = '_pca'
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"])
* (df[item] - self.data[f"{item}{id_str}_min"])
/ (self.data[f"{item}{id_str}_max"] - self.data[f"{item}{id_str}_min"])
- 1
)
@ -450,22 +469,23 @@ class FreqaiDataKitchen:
from sklearn.decomposition import PCA # avoid importing if we dont need it
n_components = self.data_dictionary["train_features"].shape[1]
pca = PCA(n_components=n_components)
pca = PCA(0.999)
pca = pca.fit(self.data_dictionary["train_features"])
n_keep_components = np.argmin(pca.explained_variance_ratio_.cumsum() < 0.999)
pca2 = PCA(n_components=n_keep_components)
n_keep_components = pca.n_components_
self.data["n_kept_components"] = n_keep_components
pca2 = pca2.fit(self.data_dictionary["train_features"])
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(pca2.explained_variance_ratio_))
train_components = pca2.transform(self.data_dictionary["train_features"])
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_data(
self.data_dictionary["train_features"])
# keeping a copy of the non-transformed features so we can check for errors during
# model load from disk
@ -473,15 +493,18 @@ class FreqaiDataKitchen:
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 = pca2.transform(self.data_dictionary["test_features"])
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 = pca2
self.pca = pca
logger.info(f"PCA reduced total features from {n_components} to {n_keep_components}")
@ -502,6 +525,9 @@ class FreqaiDataKitchen:
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:
"""