python iis.log是什么意思
时间: 2023-03-30 07:04:21 浏览: 120
Python iis.log 是指使用 Python 语言对 IIS (Internet Information Services) 日志文件进行分析和处理。IIS 是微软公司开发的 Web 服务器软件,iis.log 是 IIS 服务器记录的访问日志文件。通过使用 Python iis.log,可以对 IIS 服务器的访问日志进行统计、分析和处理,以便更好地了解网站的访问情况和用户行为。
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最大熵模型 IIS / DFP 算法代码实现
以下是最大熵模型的 IIS/DFP 算法的 Python 代码实现:
```python
import numpy as np
class MaxEnt():
def __init__(self, X, Y):
self.X = X
self.Y = Y
self.N = len(X)
self.M = len(X[0])
self.build_dict()
self.w = np.zeros(self.feature_num)
self.calcu_Z()
def build_dict(self):
self.feat_dict = {}
idx = 0
for i in range(self.N):
for j in range(self.M):
feat = str(j) + '=' + str(self.X[i][j]) + ',' + str(Y[i])
if feat not in self.feat_dict:
self.feat_dict[feat] = idx
idx += 1
self.feature_num = idx
def calcu_Z(self):
self.Z = 0
for i in range(self.N):
sum_f = 0
for j in range(self.M):
f = str(j) + '=' + str(self.X[i][j]) + ',' + str(self.Y[i])
if f in self.feat_dict:
sum_f += self.w[self.feat_dict[f]]
self.Z += np.exp(sum_f)
def calcu_px(self, X):
sum_f = 0
for j in range(self.M):
f = str(j) + '=' + str(X[j]) + ',' + str(0)
if f in self.feat_dict:
sum_f += self.w[self.feat_dict[f]]
px = np.exp(sum_f) / self.Z
return px
def calcu_Epfi(self):
Epfi = np.zeros(self.feature_num)
for i in range(self.N):
pxy = self.calcu_px(self.X[i])
for j in range(self.M):
f = str(j) + '=' + str(self.X[i][j]) + ',' + str(self.Y[i])
if f in self.feat_dict:
Epfi[self.feat_dict[f]] += pxy
return Epfi / self.N
def train(self, max_iter=1000, tol=1e-5):
for it in range(max_iter):
w_old = np.copy(self.w)
Epfi = self.calcu_Epfi()
for i in range(self.feature_num):
delta = 1.0 / self.N * np.log(self.Z) - Epfi[i]
self.w[i] += delta
self.calcu_Z()
diff = np.sum(np.abs(self.w - w_old))
if diff < tol:
break
def predict(self, X):
px = self.calcu_px(X)
py = np.zeros(2)
for i in range(2):
sum_f = 0
for j in range(self.M):
f = str(j) + '=' + str(X[j]) + ',' + str(i)
if f in self.feat_dict:
sum_f += self.w[self.feat_dict[f]]
py[i] = np.exp(sum_f) / self.Z
return np.argmax(py), px
```
其中,X 和 Y 分别为训练集的特征和标签,feature_num 表示特征的数量,w 是特征的权重,Z 表示归一化因子。calcu_Z 函数和 calcu_px 函数分别计算归一化因子和某个样本的概率值。calcu_Epfi 函数计算经验期望。train 函数使用 IIS/DFP 算法进行模型训练。predict 函数根据模型预测输入样本的标签和概率值。
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