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https://issues.apache.org/jira/browse/MAHOUT-463?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=12897601#action_12897601
]
Hui Wen Han edited comment on MAHOUT-463 at 8/12/10 3:13 AM:
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in Classs PrefsToItemUserMatrixMapper:
public class PrefsToItemUserMatrixMapper
extends
Mapper<LongWritable,Text,VarIntWritable,DistributedRowMatrix.MatrixEntryWritable>
{
@Override
protected void map(LongWritable key, Text value, Context ctx)
throws IOException, InterruptedException {
String[] tokens = TasteHadoopUtils.splitPrefTokens(value.toString());
long userID = Long.parseLong(tokens[0]);
long itemID = Long.parseLong(tokens[1]);
float prefValue = tokens.length > 2 ? Float.parseFloat(tokens[2]) : 1.0f;
int row = TasteHadoopUtils.idToIndex(itemID);
int column = TasteHadoopUtils.idToIndex(userID);
DistributedRowMatrix.MatrixEntryWritable entry = new
DistributedRowMatrix.MatrixEntryWritable();
entry.setRow(row);
entry.setCol(column);
entry.setVal(prefValue);
ctx.write(new VarIntWritable(row), entry);
}
}
if it's boolean data ,also need set prefValue =1.0f
was (Author: huiwenhan):
in Classs PrefsToItemUserMatrixMapper:
public class PrefsToItemUserMatrixMapper
extends
Mapper<LongWritable,Text,VarIntWritable,DistributedRowMatrix.MatrixEntryWritable>
{
@Override
protected void map(LongWritable key, Text value, Context ctx)
throws IOException, InterruptedException {
String[] tokens = TasteHadoopUtils.splitPrefTokens(value.toString());
long userID = Long.parseLong(tokens[0]);
long itemID = Long.parseLong(tokens[1]);
float prefValue = tokens.length > 2 ? Float.parseFloat(tokens[2]) : 1.0f;
int row = TasteHadoopUtils.idToIndex(itemID);
int column = TasteHadoopUtils.idToIndex(userID);
DistributedRowMatrix.MatrixEntryWritable entry = new
DistributedRowMatrix.MatrixEntryWritable();
entry.setRow(row);
entry.setCol(column);
entry.setVal(prefValue);
ctx.write(new VarIntWritable(row), entry);
}
}
if it's boolean data ,also need set prefValue =1.0f
> Boolean Data can not get any recommendation by running RecommnenderJob
> ----------------------------------------------------------------------
>
> Key: MAHOUT-463
> URL: https://issues.apache.org/jira/browse/MAHOUT-463
> Project: Mahout
> Issue Type: Test
> Components: Collaborative Filtering
> Affects Versions: 0.4
> Reporter: Hui Wen Han
> Fix For: 0.4
>
> Attachments: MAHOUT-463.patch
>
>
> Boolean Preference Data can not get any recommendation by run RecommnenderJob,
> but It can get data using the build in about Aprl.
> It seems that it can not get any data by running RowSimilarityJob
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