大数据分析的具体代码实例如下:
```python import pandas as pd from sklearn.modelselection import traintestsplit from sklearn.preprocessing import StandardScaler from sklearn.linearmodel import LogisticRegression from sklearn.metrics import accuracy_score
数据洗濯
data = pd.readcsv('data.csv') data = data.dropduplicates() data = data.dropna()
数据预处置惩罚
data = pd.get_dummies(data)
模型训练
X = data.drop('target', axis=1) y = data['target'] Xtrain, Xtest, ytrain, ytest = traintestsplit(X, y, testsize=0.2, randomstate=42) scaler = StandardScaler() Xtrain = scaler.fittransform(Xtrain) Xtest = scaler.transform(Xtest) model = LogisticRegression() model.fit(Xtrain, y_train)
模型评估
data = data.lower() data = re.sub(r'\W+', ' ', data)
模型训练
X = data y = ['positive' if 'pos' else 'negative'] Xtrain, Xtest, ytrain, ytest = traintestsplit(X, y, testsize=0.2, randomstate=42) vectorizer = TfidfVectorizer() Xtrain = vectorizer.fittransform(Xtrain) Xtest = vectorizer.transform(Xtest) model = LogisticRegression() model.fit(Xtrain, y_train)
模型摆设
def predict(text): text = text.lower() text = re.sub(r'\W+', ' ', text) X = vectorizer.transform([text]) ypred = model.predict(X) return ypred[0]
测试
print(predict('This is a great product!')) ```
上述代码首先使用requests和BeautifulSoup库从网页中获取数据,然后使用re库将数据处置惩罚为标准格式。
接下来使用TfidfVectorizer进行TF-IDF向量化,然后使用LogisticRegression进行逻辑回归模型训练,并使用predict函数进行模型摆设。末了测试模型是否准确预测文本情绪。
4.3 物联网
物联网的具体代码实例如下:
```python import paho.mqtt.client as mqtt import json
设备毗连
def on_connect(client, userdata, flags, rc): print('Connected with result code ' + str(rc))
数据网络