public override int nClasses()
{
return(_ds.nClasses());
}
public void InitData(IDataset ds, int nhidden, Intarray newc2i = null, Intarray newi2c = null)
{
CHECK_ARG(nhidden > 1 && nhidden < 1000000, "nhidden > 1 && nhidden < 1000000");
int ninput = ds.nFeatures();
int noutput = ds.nClasses();
w1.Resize(nhidden, ninput);
b1.Resize(nhidden);
w2.Resize(noutput, nhidden);
b2.Resize(noutput);
Intarray indexes = new Intarray();
NarrayUtil.RPermutation(indexes, ds.nSamples());
Floatarray v = new Floatarray();
for (int i = 0; i < w1.Dim(0); i++)
{
int row = indexes[i];
ds.Input1d(v, row);
float normv = (float)NarrayUtil.Norm2(v);
v /= normv * normv;
NarrayRowUtil.RowPut(w1, i, v);
}
ClassifierUtil.fill_random(b1, -1e-6f, 1e-6f);
ClassifierUtil.fill_random(w2, -1.0f / nhidden, 1.0f / nhidden);
ClassifierUtil.fill_random(b2, -1e-6f, 1e-6f);
if (newc2i != null)
c2i.Copy(newc2i);
if (newi2c != null)
i2c.Copy(newi2c);
}
public override void TrainDense(IDataset ds)
{
int nclasses = ds.nClasses();
float miters = PGetf("miters");
int niters = (int)(ds.nSamples() * miters);
niters = Math.Max(1000, Math.Min(10000000,niters));
double err = 0.0;
Floatarray x = new Floatarray();
Floatarray z = new Floatarray();
Floatarray target = new Floatarray(nclasses);
int count = 0;
for (int i = 0; i < niters; i++)
{
int row = i % ds.nSamples();
ds.Output(target, row);
ds.Input1d(x, row);
TrainOne(z, target, x, PGetf("eta"));
err += NarrayUtil.Dist2Squared(z, target);
count++;
}
err /= count;
Global.Debugf("info", " {4} n {0} niters={1} eta={2:0.#####} errors={3:0.########}",
ds.nSamples(), niters, PGetf("eta"), err, FullName);
}
public virtual void TrainBatch(IDataset ds, IDataset ts)
{
Stopwatch sw = Stopwatch.StartNew();
bool parallel = PGetb("parallel");
float eta_init = PGetf("eta_init"); // 0.5
float eta_varlog = PGetf("eta_varlog"); // 1.5
float hidden_varlog = PGetf("hidden_varlog"); // 1.2
int hidden_lo = PGeti("hidden_lo");
int hidden_hi = PGeti("hidden_hi");
int rounds = PGeti("rounds");
int mlp_noopt = PGeti("noopt");
int hidden_min = PGeti("hidden_min");
int hidden_max = PGeti("hidden_max");
CHECK_ARG(hidden_min > 1 && hidden_max < 1000000, "hidden_min > 1 && hidden_max < 1000000");
CHECK_ARG(hidden_hi >= hidden_lo, "hidden_hi >= hidden_lo");
CHECK_ARG(hidden_max >= hidden_min, "hidden_max >= hidden_min");
CHECK_ARG(hidden_lo >= hidden_min && hidden_hi <= hidden_max, "hidden_lo >= hidden_min && hidden_hi <= hidden_max");
int nn = PGeti("nensemble");
ObjList<MlpClassifier> nets = new ObjList<MlpClassifier>();
nets.Resize(nn);
for (int i = 0; i < nn; i++)
nets[i] = new MlpClassifier(i);
Floatarray errs = new Floatarray(nn);
Floatarray etas = new Floatarray(nn);
Intarray index = new Intarray();
float best = 1e30f;
if (PExists("%error"))
best = PGetf("%error");
int nclasses = ds.nClasses();
/*Floatarray v = new Floatarray();
for (int i = 0; i < ds.nSamples(); i++)
{
ds.Input1d(v, i);
CHECK_ARG(NarrayUtil.Min(v) > -100 && NarrayUtil.Max(v) < 100, "min(v)>-100 && max(v)<100");
}*/
CHECK_ARG(ds.nSamples() >= 10 && ds.nSamples() < 100000000, "ds.nSamples() >= 10 && ds.nSamples() < 100000000");
for (int i = 0; i < nn; i++)
{
// nets(i).init(data.dim(1),logspace(i,nn,hidden_lo,hidden_hi),nclasses);
if (w1.Length() > 0)
{
nets[i].Copy(this);
etas[i] = ClassifierUtil.rLogNormal(eta_init, eta_varlog);
}
else
{
nets[i].InitData(ds, (int)(logspace(i, nn, hidden_lo, hidden_hi)), c2i, i2c);
etas[i] = PGetf("eta");
}
}
etas[0] = PGetf("eta"); // zero position is identical to itself
Global.Debugf("info", "mlp training n {0} nc {1}", ds.nSamples(), nclasses);
for (int round = 0; round < rounds; round++)
{
Stopwatch swRound = Stopwatch.StartNew();
errs.Fill(-1);
if (parallel)
{
// For each network i
Parallel.For(0, nn, i =>
{
nets[i].PSet("eta", etas[i]);
nets[i].TrainDense(ds); // было XTrain
errs[i] = ClassifierUtil.estimate_errors(nets[i], ts);
});
}
else
{
for (int i = 0; i < nn; i++)
{
nets[i].PSet("eta", etas[i]);
nets[i].TrainDense(ds); // было XTrain
errs[i] = ClassifierUtil.estimate_errors(nets[i], ts);
//Global.Debugf("detail", "net({0}) {1} {2} {3}", i,
// errs[i], nets[i].Complexity(), etas[i]);
}
}
NarrayUtil.Quicksort(index, errs);
if (errs[index[0]] < best)
{
best = errs[index[0]];
cv_error = best;
this.Copy(nets[index[0]]);
this.PSet("eta", etas[index[0]]);
Global.Debugf("info", " best mlp[{0}] update errors={1} {2}", index[0], best, crossvalidate ? "cv" : "");
}
if (mlp_noopt == 0)
{
for (int i = 0; i < nn / 2; i++)
{
int j = i + nn / 2;
nets[index[j]].Copy(nets[index[i]]);
int n = nets[index[j]].nHidden();
int nm = Math.Min(Math.Max(hidden_min, (int)(ClassifierUtil.rLogNormal(n, hidden_varlog))), hidden_max);
nets[index[j]].ChangeHidden(nm);
etas[index[j]] = ClassifierUtil.rLogNormal(etas[index[i]], eta_varlog);
}
}
Global.Debugf("info", " end mlp round {0} err {1} nHidden {2}", round, best, nHidden());
swRound.Stop();
int totalTest= ts.nSamples();
int errCnt = Convert.ToInt32(best * totalTest);
OnTrainRound(this, new TrainEventArgs(
round, best, totalTest - errCnt, totalTest, best, swRound.Elapsed, TimeSpan.Zero
));
}
sw.Stop();
Global.Debugf("info", String.Format(" training time: {0} minutes, {1} seconds",
(int)sw.Elapsed.TotalMinutes, sw.Elapsed.Seconds));
PSet("%error", best);
int nsamples = ds.nSamples() * rounds;
if (PExists("%nsamples"))
nsamples += PGeti("%nsamples");
PSet("%nsamples", nsamples);
}