[MAHOUT-360] the pref score field of output of org.apache.mahout.cf.taste.hadoop.item.RecommenderJob has been truncated

• Type: Bug
• Status: Closed
• Priority: Major
• Resolution: Fixed
• Affects Version/s: 0.4
• Fix Version/s: 0.4
• Labels: RecommendedItemsWritable truncate
• Assignee: Sean R. Owen
• Reporter: Han Hui Wen
• Created: 02/Apr/10 09:54
• Updated: 31/Jan/24 22:11
• Resolved: 02/Apr/10 10:11

Description

the pref score field of output of org.apache.mahout.cf.taste.hadoop.item.RecommenderJob has been truncated if the pref score exceed six byte.

in RecommendedItemsWritable.class

@Override
public String toString() {
StringBuilder result = new StringBuilder(200);
result.append('[');
boolean first = true;
for (RecommendedItem item : recommended) {
if (first)

{ first = false; }

else

{ result.append(','); }

result.append(item.getItemID());
result.append(':');
String valueString = String.valueOf(item.getValue());
// Is this rounding too crude?
if (valueString.indexOf('E') >= 0)

{ valueString = "0.0"; }

else if (valueString.length() > 6)

{ valueString = valueString.substring(0, 6); //here may cause problem,we can reserve all the bytes ,or just one byte decimal fraction }

result.append(valueString);
}
result.append(']');
return result.toString();
}