@Override
public String toString() {
return "ALSSpeedModel[features:"
+ features
+ ", X:("
+ X.size()
+ " users), Y:("
+ Y.size()
+ " items)]";
}
public void retainAllUsers(Collection<String> users) {
Lock lock = xLock.writeLock();
lock.lock();
try {
X.removeAll(new NotContainsPredicate<>(users));
} finally {
lock.unlock();
}
}
public float[] getItemVector(String item) {
Lock lock = yLock.readLock();
lock.lock();
try {
return Y.get(item);
} finally {
lock.unlock();
}
}
public float[] getUserVector(String user) {
Lock lock = xLock.readLock();
lock.lock();
try {
return X.get(user);
} finally {
lock.unlock();
}
}
public void retainAllItems(Collection<String> items) {
Lock lock = yLock.writeLock();
lock.lock();
try {
Y.removeAll(new NotContainsPredicate<>(items));
} finally {
lock.unlock();
}
}
public void setItemVector(String item, float[] vector) {
Preconditions.checkNotNull(vector);
Preconditions.checkArgument(vector.length == features);
Lock lock = yLock.writeLock();
lock.lock();
try {
Y.put(item, vector);
} finally {
lock.unlock();
}
}
public void setUserVector(String user, float[] vector) {
Preconditions.checkNotNull(vector);
Preconditions.checkArgument(vector.length == features);
Lock lock = xLock.writeLock();
lock.lock();
try {
X.put(user, vector);
} finally {
lock.unlock();
}
}
public Solver getYTYSolver() {
RealMatrix YTY;
Lock lock = yLock.readLock();
lock.lock();
try {
YTY = VectorMath.transposeTimesSelf(Y.values());
} finally {
lock.unlock();
}
return new LinearSystemSolver().getSolver(YTY);
}
public Solver getXTXSolver() {
RealMatrix XTX;
Lock lock = xLock.readLock();
lock.lock();
try {
XTX = VectorMath.transposeTimesSelf(X.values());
} finally {
lock.unlock();
}
return new LinearSystemSolver().getSolver(XTX);
}