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https://issues.apache.org/jira/browse/MAHOUT-802?focusedWorklogId=1001419&page=com.atlassian.jira.plugin.system.issuetabpanels:worklog-tabpanel#worklog-1001419
]
ASF GitHub Bot logged work on MAHOUT-802:
-----------------------------------------
Author: ASF GitHub Bot
Created on: 22/Jan/26 17:48
Start Date: 22/Jan/26 17:48
Worklog Time Spent: 10m
Work Description: viiccwen opened a new pull request, #918:
URL: https://github.com/apache/mahout/pull/918
### Purpose of PR
This PR implements GPU-accelerated L2 norm calculation for batches of
float32 vectors, extending the single-vector implementation to support
efficient batch processing. This is essential for encoding multiple samples
simultaneously in quantum machine learning workflows.
It's follow-up PR for #916 , pls review it at first.
## Changes
### CUDA Kernels (`qdp/qdp-kernels/src/amplitude.cu`)
- Added `l2_norm_batch_kernel_f32()`, `launch_l2_norm_batch_f32()`
### Rust Bindings (`qdp/qdp-kernels/src/lib.rs`)
- Added `launch_l2_norm_batch_f32` function.
- Added dummy implementation for non-Linux platforms (returns error code 999)
### Tests (`qdp/qdp-kernels/tests/amplitude_encode.rs`)
- Added `test_l2_norm_batch_kernel_f32()` test case
- Test verifies correctness for each sample in the batch
- Tests with multiple batch sizes (3 samples in test case)
### Related Issues or PRs
closes #917
### Changes Made
<!
Issue Time Tracking
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Worklog Id: (was: 1001419)
Remaining Estimate: 0h
Time Spent: 10m
> Start Phase doesn't properly work in RecommenderJob
> ---------------------------------------------------
>
> Key: MAHOUT-802
> URL: https://issues.apache.org/jira/browse/MAHOUT-802
> Project: Mahout
> Issue Type: Bug
> Reporter: Grant Ingersoll
> Assignee: Grant Ingersoll
> Priority: Minor
> Fix For: 0.6
>
> Attachments: MAHOUT-802.patch, MAHOUT-802b.patch
>
> Time Spent: 10m
> Remaining Estimate: 0h
>
> I'm trying to run RecommenderJob and do --startPhase 2 since I have my prefs
> already in the right format. Unfortunately, when I do that, I get:
> {quote}
> java.lang.IllegalArgumentException: Number of columns was not correctly set!
> at
> com.google.common.base.Preconditions.checkArgument(Preconditions.java:88)
> at
> org.apache.mahout.math.hadoop.similarity.RowSimilarityJob$SimilarityReducer.setup(RowSimilarityJob.java:296)
> at org.apache.hadoop.mapreduce.Reducer.run(Reducer.java:174)
> at
> org.apache.hadoop.mapred.ReduceTask.runNewReducer(ReduceTask.java:648)
> at org.apache.hadoop.mapred.ReduceTask.run(ReduceTask.java:416)
> at
> org.apache.hadoop.mapred.LocalJobRunner$Job.run(LocalJobRunner.java:256)
> {quote}
> This appears to be due to the fact that the numberOfUsers variable defaults
> to 0 and is only set when phase 1 is run.
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