static public String toString( float fs[] ) {
SB sb = new SB();
sb.p('[');
for( float f : fs )
sb.p(f==Float.MAX_VALUE ? "max": (f==-Float.MAX_VALUE ? "min": Float.toString(f))).p(',');
return sb.p(']').toString();
}
@Override
protected void toJavaUnifyPreds(SB bodySb) {
if (isClassifier()) {
bodySb.i().p("float sum = 0;").nl();
bodySb.i().p("for(int i=1; i<preds.length; i++) sum += preds[i];").nl();
bodySb.i().p("if (sum>0) for(int i=1; i<preds.length; i++) preds[i] /= sum;").nl();
} else bodySb.i().p("preds[1] = preds[1]/NTREES;").nl();
}
/**
* @param flags Flags.
* @return String builder containing all flags.
*/
static String toString(short flags) {
SB sb = new SB();
for (Mask m : MASKS) {
if (m.ordinal() != 0) sb.a('|');
sb.a(m.name().toLowerCase()).a('=').a(m.bit(flags));
}
return sb.toString();
}
public static SB getBase64(byte[] bytes) {
long nBytes = bytes.length;
SB sout = new SB();
if (nBytes == 0) return sout;
for (int i = 0, nPad = 0; i < nBytes && nPad == 0; ) {
if (i % 75 == 0 && i != 0) sout.append("\r\n");
nPad = (i + 2 == nBytes ? 1 : i + 1 == nBytes ? 2 : 0);
int outbytes =
((bytes[i++] << 16) & 0xFF0000)
| ((nPad == 2 ? 0 : bytes[i++] << 8) & 0x00FF00)
| ((nPad >= 1 ? 0 : (int) bytes[i++]) & 0x0000FF);
// System.out.println(Integer.toHexString(outbytes));
sout.appendC(base64.charAt((outbytes >> 18) & 0x3F));
sout.appendC(base64.charAt((outbytes >> 12) & 0x3F));
sout.appendC(nPad == 2 ? '=' : base64.charAt((outbytes >> 6) & 0x3F));
sout.appendC(nPad >= 1 ? '=' : base64.charAt(outbytes & 0x3F));
}
return sout;
}
/**
* Builds ignite.sh attributes to set up SSH username and password and log directory for started
* node.
*
* @param username SSH user name.
* @param host Host.
* @return {@code ignite.sh} script arguments.
*/
private String buildRemoteLogArguments(String username, String host) {
assert username != null;
assert host != null;
SB sb = new SB();
sb.a(" -J-D")
.a(IGNITE_SSH_HOST)
.a("=\"")
.a(host)
.a("\"")
.a(" -J-D")
.a(IGNITE_SSH_USER_NAME)
.a("=\"")
.a(username)
.a("\"");
return sb.toString();
}
/**
* Pretty-formatting for duration.
*
* @param ms Millisecond to format.
* @return Formatted presentation.
*/
private static String formatDuration(long ms) {
assert ms >= 0;
if (ms == 0) return "< 1 ms";
SB sb = new SB();
long dd = ms / 1440000; // 1440 mins = 60 mins * 24 hours
if (dd > 0) sb.a(dd).a(dd == 1 ? " day " : " days ");
ms %= 1440000;
long hh = ms / 60000;
if (hh > 0) sb.a(hh).a(hh == 1 ? " hour " : " hours ");
long min = ms / 60000;
if (min > 0) sb.a(min).a(min == 1 ? " min " : " mins ");
ms %= 60000;
if (ms > 0) sb.a(ms).a(" ms ");
return sb.toString().trim();
}
@Override
protected void toJavaUnifyPreds(SB bodyCtxSB) {
if (isClassifier()) {
bodyCtxSB
.i()
.p(
"// Compute Probabilities for classifier (scale via http://www.hongliangjie.com/2011/01/07/logsum/)")
.nl();
bodyCtxSB.i().p("float dsum = 0, maxval = Float.NEGATIVE_INFINITY;").nl();
if (nclasses() == 2) {
bodyCtxSB.i().p("preds[2] = -preds[1];").nl();
}
bodyCtxSB
.i()
.p("for(int i=1; i<preds.length; i++) maxval = Math.max(maxval, preds[i]);")
.nl();
bodyCtxSB
.i()
.p(
"for(int i=1; i<preds.length; i++) dsum += (preds[i]=(float) Math.exp(preds[i] - maxval));")
.nl();
bodyCtxSB.i().p("for(int i=1; i<preds.length; i++) preds[i] = preds[i] / dsum;").nl();
}
}