マッパーからの値として 2 つの 2 次元配列を出力しようとしています。Hadoop では、入力としてTwoDArrayWritable
1 - を取るものがあり2D array
ます。私のユースケースを達成するために、編集TwoDArrayWritable
して入力を取得しようとしました2
-2D array
/**
* A Writable for 2D arrays containing a matrix of instances of a class.
*/
public class MyTwoDArrayWritable implements Writable {
private Class valueClass;
private Writable[][] values;
private Class valueClass1;
private Writable[][] values1;
public MyTwoDArrayWritable(Class valueClass,Class valueClass1) {
this.valueClass = valueClass;
this.valueClass1 = valueClass1;
}
public MyTwoDArrayWritable(Class valueClass, DoubleWritable[][] values,Class valueClass1, DoubleWritable[][] values1) {
this(valueClass, valueClass1);
this.values = values;
this.values1 = values1;
}
public Object toArray() {
int dimensions[] = {values.length, 0};
Object result = Array.newInstance(valueClass, dimensions);
for (int i = 0; i < values.length; i++) {
Object resultRow = Array.newInstance(valueClass, values[i].length);
Array.set(result, i, resultRow);
for (int j = 0; j < values[i].length; j++) {
Array.set(resultRow, j, values[i][j]);
}
}
return result;
}
/**
* @return the valueClass
*/
public Class getValueClass() {
return valueClass;
}
/**
* @param valueClass the valueClass to set
*/
public void setValueClass(Class valueClass) {
this.valueClass = valueClass;
}
/**
* @return the values
*/
public Writable[][] getValues() {
return values;
}
/**
* @param values the values to set
*/
public void setValues(DoubleWritable[][] values,DoubleWritable[][] values1) {
this.values = values;
this.values = values1;
}
/**
* @return the valueClass1
*/
public Class getValueClass1() {
return valueClass1;
}
/**
* @param valueClass1 the valueClass1 to set
*/
public void setValueClass1(Class valueClass1) {
this.valueClass1 = valueClass1;
}
/**
* @return the values1
*/
public Writable[][] getValues1() {
return values1;
}
public void readFields(DataInput in) throws IOException {
// construct matrix
values = new Writable[in.readInt()][];
for (int i = 0; i < values.length; i++) {
values[i] = new Writable[in.readInt()];
}
// construct values
for (int i = 0; i < values.length; i++) {
for (int j = 0; j < values[i].length; j++) {
Writable value; // construct value
try {
value = (Writable) valueClass.newInstance();
} catch (InstantiationException e) {
throw new RuntimeException(e.toString());
} catch (IllegalAccessException e) {
throw new RuntimeException(e.toString());
}
value.readFields(in); // read a value
values[i][j] = value; // store it in values
}
}
}
public void write(DataOutput out) throws IOException {
out.writeInt(values.length); // write values
for (int i = 0; i < values.length; i++) {
out.writeInt(values[i].length);
}
for (int i = 0; i < values.length; i++) {
for (int j = 0; j < values[i].length; j++) {
values[i][j].write(out);
}
}
}
}
マッパーから2つの2D double配列を発行しました。
MyTwoDArrayWritable array = new MyTwoDArrayWritable (DoubleWritable.class,DoubleWritable.class);
DoubleWritable[][] myInnerArray = new DoubleWritable[EtransEkey.length][EtransEkey[0].length];
DoubleWritable[][] myInnerArray1 = new DoubleWritable[EtransDevalue.length][EtransDevalue[0].length];
// set values in myInnerArray
for (int k1 = 0; k1 < EtransEkey.length; k1++) {
for(int j1=0;j1< EtransEkey[0].length;j1++){
myInnerArray[k1][j1] = new DoubleWritable(EtransEkey[k1][j1]);
}
}
for (int k1 = 0; k1 < EtransDevalue.length; k1++) {
for(int j1=0;j1< EtransDevalue[0].length;j1++){
myInnerArray1[k1][j1] = new DoubleWritable(EtransDevalue[k1][j1]);
}
}
array.set(myInnerArray,myInnerArray1);
エラー表示中array.set(myInnerArray,myInnerArray1);
/*
* The method set(DoubleWritable[][], DoubleWritable[][]) is undefined for the type MyTwoDArrayWritableritable
*/
編集:レデューサーでこれらの値を反復処理して、myInnerArray マトリックスと myInnerArray1 マトリックスを取得する方法は?
これまで私がやったことは
for (MyTwoDArrayWritable c : values) {
System.out.println(c.getValues());
DoubleWritable[][] myInnerArray = new DoubleWritable[KdimRow][KdimCol];
for (int k1 = 0; k1 < KdimRow; k1++) {
for(int j1=0;j1< KdimCol;j1++){
myInnerArray[k1][j1] = new DoubleWritable();
}
}
しかし、それらを double 配列に戻すにはどうすればよいでしょうか?