[英]ask step by step levenberg-marquardt in java
I'm trying to write levenberg marquardt
in Java, here's my code: 我正在尝试用Java编写
levenberg marquardt
,这是我的代码:
while (iter <= 10 || mse < 0.0001) {
call.calc_jacobian(ff, trainlm, input, akt1, akt2, w, x, t);
double[][] jacobian = trainlm.ret_jacob();
double[][] error = trainlm.ret_err();
mse = trainlm.ret_mse() / 4;
mse_all[iter] = mse;
test: for (int m = 0; m <= 5; m++) {
upb.koreksi_w(miu, hidden, jacobian, error, w);
double[][] w_new = upb.ret_upw();
call.test_ff(ff, trainlm, input, akt1, akt2, w_new, x, t);
double mse2 = trainlm.ret_mse() / 4;
if (mse2 < mse || m == 5) {
miu = miu / beta;
w_skrg = w_baru;
iter++;
break test;
} else {
miu = miu * beta;
}
}
}
The function calc_jacobian
is a function I use to compute feed-forward and back-propagate operation to calculate the value of Jacobian. 函数
calc_jacobian
是我用来计算前馈和反向传播运算以计算Jacobian值的函数。 The function koreksi_w
use to update new weight using Jacobian, error, miu, and actual weight, it will give a new weight and test_ff
calculate feedforward to get mse
value. 函数
koreksi_w
用于使用Jacobian,误差,miu和实际权重来更新新权重,它将给出新的权重,并且test_ff
计算前馈以获取mse
值。
My problem is that when I try to run those code, the value of mse doesn't decrease, so I use trainlm
function in matlab
to run with the same input & weight, to prove that input & wight isn't the problem and in matlab
, the mse
decrease. 我的问题是,当我尝试运行这些代码时,mse的值不会减少,因此我在
matlab
使用trainlm
函数以相同的输入和权重运行,以证明输入和权重不是问题,并且matlab
, mse
下降。
I don't understand your piece of code, but are you sure it is Integer division
that you want when you do : 我不理解您的代码,但是确定执行此操作时要确定它是
Integer division
:
mse = trainlm.ret_mse() / 4; //OR:
double mse2 = trainlm.ret_mse() / 4;
As you expect a double, I would suggest a cast or something like so : 如您所愿,我建议使用强制转换或类似方法:
double mse2 = trainlm.ret_mse() / (double)4; //OR:
double mse2 = trainlm.ret_mse() / 4.0;
Check also miu = miu / beta;
还要检查
miu = miu / beta;
(is beta
a double ?) (
beta
是两倍吗?)
I suspect MathLab
does floating point division where java doesn't... 我怀疑
MathLab
在Java不执行的情况下进行浮点除法...
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