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metric.py
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metric.py
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import logging
log = logging.getLogger(__name__)
import numpy as np
import pandas as pd
import scipy as sp
from sklearn.metrics import log_loss
from sklearn.metrics import roc_auc_score
from sklearn.metrics import mean_squared_error
from sklearn.metrics import mean_absolute_error
from sklearn.metrics import accuracy_score
from sklearn.metrics import r2_score
from sklearn.metrics import mean_absolute_percentage_error
from sklearn.metrics import mean_squared_log_error
from sklearn.metrics import f1_score
from sklearn.metrics import average_precision_score
from sklearn.metrics import accuracy_score
def logloss(y_true, y_predicted, sample_weight=None):
epsilon = 1e-6
y_predicted = sp.maximum(epsilon, y_predicted)
y_predicted = sp.minimum(1 - epsilon, y_predicted)
ll = log_loss(y_true, y_predicted, sample_weight=sample_weight)
return ll
def rmse(y_true, y_predicted, sample_weight=None):
val = mean_squared_error(y_true, y_predicted, sample_weight=sample_weight)
return np.sqrt(val) if val > 0 else -np.Inf
def rmsle(y_true, y_predicted, sample_weight=None):
val = mean_squared_log_error(y_true, y_predicted, sample_weight=sample_weight)
return np.sqrt(val) if val > 0 else -np.Inf
def negative_auc(y_true, y_predicted, sample_weight=None):
val = roc_auc_score(y_true, y_predicted, sample_weight=sample_weight)
return -1.0 * val
def negative_r2(y_true, y_predicted, sample_weight=None):
val = r2_score(y_true, y_predicted, sample_weight=sample_weight)
return -1.0 * val
def negative_f1(y_true, y_predicted, sample_weight=None):
if isinstance(y_true, pd.DataFrame):
y_true = np.array(y_true)
if isinstance(y_predicted, pd.DataFrame):
y_predicted = np.array(y_predicted)
if len(y_predicted.shape) == 2 and y_predicted.shape[1] == 1:
y_predicted = y_predicted.ravel()
average = None
if len(y_predicted.shape) == 1 or (len(y_predicted.shape) == 2 and y_predicted.shape[1] == 1):
y_predicted = (y_predicted > 0.5).astype(int)
average = "binary"
else:
y_predicted = np.argmax(y_predicted, axis=1)
average = "micro"
val = f1_score(y_true, y_predicted, sample_weight=sample_weight, average=average)
return -val
def negative_accuracy(y_true, y_predicted, sample_weight=None):
if isinstance(y_true, pd.DataFrame):
y_true = np.array(y_true)
if isinstance(y_predicted, pd.DataFrame):
y_predicted = np.array(y_predicted)
if len(y_predicted.shape) == 2 and y_predicted.shape[1] == 1:
y_predicted = y_predicted.ravel()
if len(y_predicted.shape) == 1:
y_predicted = (y_predicted > 0.5).astype(int)
else:
y_predicted = np.argmax(y_predicted, axis=1)
val = accuracy_score(y_true, y_predicted, sample_weight=sample_weight)
return -val
def negative_average_precision(y_true, y_predicted, sample_weight=None):
if isinstance(y_true, pd.DataFrame):
y_true = np.array(y_true)
if isinstance(y_predicted, pd.DataFrame):
y_predicted = np.array(y_predicted)
val = average_precision_score(y_true, y_predicted, sample_weight=sample_weight)
return -val
def negative_spearman(y_true, y_predicted, sample_weight=None):
# sample weight is ignored
c, _ = sp.stats.spearmanr(y_true, y_predicted)
return -c
def negative_pearson(y_true, y_predicted, sample_weight=None):
# sample weight is ignored
if isinstance(y_true, pd.DataFrame):
y_true = np.array(y_true).ravel()
if isinstance(y_predicted, pd.DataFrame):
y_predicted = np.array(y_predicted).ravel()
return -np.corrcoef(y_true, y_predicted)[0, 1]
class MetricException(Exception):
def __init__(self, message):
Exception.__init__(self, message)
log.error(message)
def xgboost_eval_metric_r2(preds, dtrain):
# Xgboost needs to minimize eval_metric
target = dtrain.get_label()
weight = dtrain.get_weight()
if len(weight) == 0:
weight = None
return "r2", -r2_score(target, preds, sample_weight=weight)
def xgboost_eval_metric_spearman(preds, dtrain):
# Xgboost needs to minimize eval_metric
target = dtrain.get_label()
return "spearman", negative_spearman(target, preds)
def xgboost_eval_metric_pearson(preds, dtrain):
# Xgboost needs to minimize eval_metric
target = dtrain.get_label()
return "pearson", negative_pearson(target, preds)
def xgboost_eval_metric_f1(preds, dtrain):
# Xgboost needs to minimize eval_metric
target = dtrain.get_label()
weight = dtrain.get_weight()
if len(weight) == 0:
weight = None
return "f1", negative_f1(target, preds, weight)
def xgboost_eval_metric_average_precision(preds, dtrain):
# Xgboost needs to minimize eval_metric
target = dtrain.get_label()
weight = dtrain.get_weight()
if len(weight) == 0:
weight = None
return "average_precision", negative_average_precision(target, preds, weight)
def xgboost_eval_metric_accuracy(preds, dtrain):
# Xgboost needs to minimize eval_metric
target = dtrain.get_label()
weight = dtrain.get_weight()
if len(weight) == 0:
weight = None
return "accuracy", negative_accuracy(target, preds, weight)
def lightgbm_eval_metric_r2(preds, dtrain):
target = dtrain.get_label()
weight = dtrain.get_weight()
return "r2", r2_score(target, preds, sample_weight=weight), True
def lightgbm_eval_metric_spearman(preds, dtrain):
target = dtrain.get_label()
return "spearman", -negative_spearman(target, preds), True
def lightgbm_eval_metric_pearson(preds, dtrain):
target = dtrain.get_label()
return "pearson", -negative_pearson(target, preds), True
def lightgbm_eval_metric_f1(preds, dtrain):
target = dtrain.get_label()
weight = dtrain.get_weight()
unique_targets = np.unique(target)
if len(unique_targets) > 2:
cols = len(unique_targets)
rows = int(preds.shape[0] / len(unique_targets))
preds = np.reshape(preds, (rows, cols), order="F")
return "f1", -negative_f1(target, preds, weight), True
def lightgbm_eval_metric_average_precision(preds, dtrain):
target = dtrain.get_label()
weight = dtrain.get_weight()
return "average_precision", -negative_average_precision(target, preds, weight), True
def lightgbm_eval_metric_accuracy(preds, dtrain):
target = dtrain.get_label()
weight = dtrain.get_weight()
unique_targets = np.unique(target)
if len(unique_targets) > 2:
cols = len(unique_targets)
rows = int(preds.shape[0] / len(unique_targets))
preds = np.reshape(preds, (rows, cols), order="F")
return "accuracy", -negative_accuracy(target, preds, weight), True
class CatBoostEvalMetricSpearman(object):
def get_final_error(self, error, weight):
return error
def is_max_optimal(self):
return True
def evaluate(self, approxes, target, weight):
assert len(approxes) == 1
assert len(target) == len(approxes[0])
preds = np.array(approxes[0])
target = np.array(target)
return -negative_spearman(target, preds), 0
class CatBoostEvalMetricPearson(object):
def get_final_error(self, error, weight):
return error
def is_max_optimal(self):
return True
def evaluate(self, approxes, target, weight):
assert len(approxes) == 1
assert len(target) == len(approxes[0])
preds = np.array(approxes[0])
target = np.array(target)
return -negative_pearson(target, preds), 0
class CatBoostEvalMetricAveragePrecision(object):
def get_final_error(self, error, weight):
return error
def is_max_optimal(self):
return True
def evaluate(self, approxes, target, weight):
assert len(approxes) == 1
assert len(target) == len(approxes[0])
preds = np.array(approxes[0])
target = np.array(target)
weight = None # np.array(weight)
return -negative_average_precision(target, preds, weight), 0
class Metric(object):
def __init__(self, params):
if params is None:
raise MetricException("Metric params not defined")
self.params = params
self.name = self.params.get("name")
if self.name is None:
raise MetricException("Metric name not defined")
self.minimize_direction = self.name in [
"logloss",
"auc", # negative auc
"rmse",
"mae",
"mse",
"r2", # negative r2
"mape",
"spearman", # negative
"pearson", # negative
"f1", # negative
"average_precision", # negative
"accuracy", # negative
]
if self.name == "logloss":
self.metric = logloss
elif self.name == "auc":
self.metric = negative_auc
elif self.name == "acc":
self.metric = accuracy_score
elif self.name == "rmse":
self.metric = rmse
elif self.name == "mse":
self.metric = mean_squared_error
elif self.name == "mae":
self.metric = mean_absolute_error
elif self.name == "r2":
self.metric = negative_r2
elif self.name == "mape":
self.metric = mean_absolute_percentage_error
elif self.name == "spearman":
self.metric = negative_spearman
elif self.name == "pearson":
self.metric = negative_pearson
elif self.name == "f1":
self.metric = negative_f1
elif self.name == "average_precision":
self.metric = negative_average_precision
elif self.name == "accuracy":
self.metric = negative_accuracy
# elif self.name == "rmsle": # need to update target preprocessing
# self.metric = rmsle # to assure that target is not negative ...
else:
raise MetricException(f"Unknown metric '{self.name}'")
def __call__(self, y_true, y_predicted, sample_weight=None):
return self.metric(y_true, y_predicted, sample_weight=sample_weight)
def improvement(self, previous, current):
if self.minimize_direction:
return current < previous
return current > previous
def get_maximum(self):
if self.minimize_direction:
return 10e12
else:
return -10e12
def worst_value(self):
if self.minimize_direction:
return np.Inf
return -np.Inf
def get_minimize_direction(self):
return self.minimize_direction
def is_negative(self):
return self.name in [
"auc",
"r2",
"spearman",
"pearson",
"f1",
"average_precision",
"accuracy",
]
@staticmethod
def optimize_negative(metric_name):
return metric_name in [
"auc",
"r2",
"spearman",
"pearson",
"f1",
"average_precision",
"accuracy",
]