[英]ValueError: Input contains NaN, infinity or a value too large for dtype('float64') with scikit-learn
[英]Scikit-learn : Input contains NaN, infinity or a value too large for dtype ('float64')
我正在使用 Python scikit-learn 對從 csv 獲得的數據進行簡單的線性回歸。
reader = pandas.io.parsers.read_csv("data/all-stocks-cleaned.csv")
stock = np.array(reader)
openingPrice = stock[:, 1]
closingPrice = stock[:, 5]
print((np.min(openingPrice)))
print((np.min(closingPrice)))
print((np.max(openingPrice)))
print((np.max(closingPrice)))
peningPriceTrain, openingPriceTest, closingPriceTrain, closingPriceTest = \
train_test_split(openingPrice, closingPrice, test_size=0.25, random_state=42)
openingPriceTrain = np.reshape(openingPriceTrain,(openingPriceTrain.size,1))
openingPriceTrain = openingPriceTrain.astype(np.float64, copy=False)
# openingPriceTrain = np.arange(openingPriceTrain, dtype=np.float64)
closingPriceTrain = np.reshape(closingPriceTrain,(closingPriceTrain.size,1))
closingPriceTrain = closingPriceTrain.astype(np.float64, copy=False)
openingPriceTest = np.reshape(openingPriceTest,(openingPriceTest.size,1))
closingPriceTest = np.reshape(closingPriceTest,(closingPriceTest.size,1))
regression = linear_model.LinearRegression()
regression.fit(openingPriceTrain, closingPriceTrain)
predicted = regression.predict(openingPriceTest)
最小值和最大值顯示為 0.0 0.6 41998.0 2593.9
然而我收到這個錯誤 ValueError: Input contains NaN, infinity or a value too large for dtype('float64').
我應該如何消除這個錯誤? 因為從上面的結果來看,它確實不包含無窮大或 Nan 值。
對此有什么解決方案?
編輯:all-stocks-cleaned.csv 在http://www.sharecsv.com/s/cb31790afc9b9e33c5919cdc562630f3/all-stocks-cleaned.csv可用
您回歸的問題在於NaN
不知何故潛入了您的數據。 這可以使用以下代碼片段輕松檢查:
import pandas as pd
import numpy as np
from sklearn import linear_model
from sklearn.cross_validation import train_test_split
reader = pd.io.parsers.read_csv("./data/all-stocks-cleaned.csv")
stock = np.array(reader)
openingPrice = stock[:, 1]
closingPrice = stock[:, 5]
openingPriceTrain, openingPriceTest, closingPriceTrain, closingPriceTest = \
train_test_split(openingPrice, closingPrice, test_size=0.25, random_state=42)
openingPriceTrain = openingPriceTrain.reshape(openingPriceTrain.size,1)
openingPriceTrain = openingPriceTrain.astype(np.float64, copy=False)
closingPriceTrain = closingPriceTrain.reshape(closingPriceTrain.size,1)
closingPriceTrain = closingPriceTrain.astype(np.float64, copy=False)
openingPriceTest = openingPriceTest.reshape(openingPriceTest.size,1)
openingPriceTest = openingPriceTest.astype(np.float64, copy=False)
np.isnan(openingPriceTrain).any(), np.isnan(closingPriceTrain).any(), np.isnan(openingPriceTest).any()
(True, True, True)
如果您嘗試輸入缺失值,如下所示:
openingPriceTrain[np.isnan(openingPriceTrain)] = np.median(openingPriceTrain[~np.isnan(openingPriceTrain)])
closingPriceTrain[np.isnan(closingPriceTrain)] = np.median(closingPriceTrain[~np.isnan(closingPriceTrain)])
openingPriceTest[np.isnan(openingPriceTest)] = np.median(openingPriceTest[~np.isnan(openingPriceTest)])
您的回歸將順利運行,沒有問題:
regression = linear_model.LinearRegression()
regression.fit(openingPriceTrain, closingPriceTrain)
predicted = regression.predict(openingPriceTest)
predicted[:5]
array([[ 13598.74748173],
[ 53281.04442146],
[ 18305.4272186 ],
[ 50753.50958453],
[ 14937.65782778]])
簡而言之:正如錯誤消息所說,您的數據中存在缺失值。
編輯::
也許一種更簡單、更直接的方法是在使用 Pandas 讀取數據后立即檢查是否有任何丟失的數據:
data = pd.read_csv('./data/all-stocks-cleaned.csv')
data.isnull().any()
Date False
Open True
High True
Low True
Last True
Close True
Total Trade Quantity True
Turnover (Lacs) True
然后使用以下兩行中的任何一行來估算數據:
data = data.fillna(lambda x: x.median())
或者
data = data.fillna(method='ffill')
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