我正在尝试使用 Jama 库编写我的 sigmoid 函数。我不确定我的代码是否有效,所以我sigmoidFunction
在我的测试函数中调用了我的代码:
public matrix sigmoidFunction() {
matrix theta = new matrix(x_theta,m);
matrix X = new matrix(x);
matrix theta_transpose = theta.transpose();
matrix HX = theta_transpose.times(X);
double[][] hx = HX.getArray();
int m = HX.getRowdimension();
int n = HX .getColdimension();
for (int i = 0; i < m; i++) {
for (int j = 0; j<n; j++) {
hx[i][j] = 1 / (1 + StrictMath.exp(hx[i][j]));
}
}
matrix sigmoid = new matrix(hx);
return sigmoid;
}
但是,当我运行它时,没有输出。就好像我的sigmoidFunction
. 我不知道为什么。
public static void main(String[] args) {
double[ ][ ] x={ {1,2}, {1,2}, {1,2} ,{1,2}, {1,2} };
double[] theta = {0.5,0.005};
double[] y = {1,1,0,1,0};
LogisticRegression l = new LogisticRegression(x,theta,y);
System.out.println(l.sigmoidFunction().getArray()[1]);
}