Biowulf High Performance Computing at the NIH
omeClust on Biowulf

Detects clusters of features using omics data and scores metadata (resolution score) based on their influences in clustering. The similarity of features within each cluster can be different (different resolution). Resolution of similarity score takes to account not only similarity between measurements and also the structure in a hierarchical structure of data and number of features which group together.

Important Notes

Interactive job
Interactive jobs should be used for debugging, graphics, or applications that cannot be run as batch jobs.

Allocate an interactive session and run the program.
Sample session (user input in bold):

[user@biowulf ~]$ sinteractive --cpus-per-task=2 --mem=4g --gres=lscratch:10
salloc.exe: Pending job allocation 1059698
salloc.exe: job 1059698 queued and waiting for resources
salloc.exe: job 1059698 has been allocated resources
salloc.exe: Granted job allocation 1059698
salloc.exe: Waiting for resource configuration
salloc.exe: Nodes cn0852 are ready for job
srun: error: x11: no local DISPLAY defined, skipping

[user@cn0852 ~]$ cd /lscratch/$SLURM_JOB_ID

[user@cn0852 1059698]$ git clone
Cloning into 'omeClust'...
remote: Enumerating objects: 389, done.
remote: Counting objects: 100% (389/389), done.
remote: Compressing objects: 100% (282/282), done.
remote: Total 389 (delta 237), reused 246 (delta 99), pack-reused 0
Receiving objects: 100% (389/389), 5.40 MiB | 0 bytes/s, done.
Resolving deltas: 100% (237/237), done.

[user@cn0852 1059698]$ module load omeClust
[+] Loading omeClust  1.1.6  on cn0852
[+] Loading singularity  3.6.4  on cn0852

[user@cn0852 1059698]$ cd omeClust/

[user@cn0852 omeClust]$ omeClust -i data/synthetic/dist_4_0.001_4_200.txt \
    --metadata data/synthetic/truth_4_0.001_4_200.txt \
    -o omeclust_demo \
/usr/local/lib/python3.6/dist-packages/omeClust/ RuntimeWarning: invalid value encountered in double_scalars
  s = (b - a) / max(a, b)
The number of major clusters:  3
Ground truth  is the most influential metadata in clusters
There are 3 clusters
Output is written in omeclust_demo

[user@cn0852 omeClust]$ ls omeclust_demo/
adist.txt                  Ground truth_MDS_3D_plot.pdf   Ground truth_PCoA_plot.pdf
clusters.txt               Ground truth_MDS_plot.pdf      Ground truth_t-SNE_3D_plot.pdf
dendrogram.pdf             Ground truth_PCA_3D_plot.pdf   Ground truth_t-SNE_plot.pdf
discretize_metadata.txt    Ground truth_PCA_plot.pdf      network_plot.pdf
feature_cluster_label.txt  Ground truth_PCoA_3D_plot.pdf  omeClust_log.txt

[user@cn0852 omeClust]$ exit
salloc.exe: Relinquishing job allocation 1059698
salloc.exe: Job allocation 1059698 has been revoked.

[user@biowulf ~]$ 

Batch job
Most jobs should be run as batch jobs.

Create a batch input file (e.g. For example:

set -e
module load omeClust
omeClust \
    -i data/synthetic/dist_4_0.001_4_200.txt \
    --metadata data/synthetic/truth_4_0.001_4_200.txt \
    -o omeclust_demo \

Submit this job using the Slurm sbatch command.

sbatch [--cpus-per-task=#] [--mem=#]
Swarm of Jobs
A swarm of jobs is an easy way to submit a set of independent commands requiring identical resources.

Create a swarmfile (e.g. omeClust.swarm). For example:

omeClust -i adist1.txt -o output1 --metadata metadata1.txt --plot
omeClust -i adist2.txt -o output2 --metadata metadata2.txt --plot
omeClust -i adist3.txt -o output3 --metadata metadata3.txt --plot
omeClust -i adist4.txt -o output4 --metadata metadata4.txt --plot

Submit this job using the swarm command.

swarm -f omeClust.swarm [-g #] [-t #] --module omeClust
-g # Number of Gigabytes of memory required for each process (1 line in the swarm command file)
-t # Number of threads/CPUs required for each process (1 line in the swarm command file).
--module omeClust Loads the omeClust module for each subjob in the swarm