Dear All,

I'm happy to announce that we have just reached a significant
milestone in the last day of 2009 -- successful automated (continuous)
testing of MLR model training. The workflow involves 3 OpenTox
services (dataset, feature and model) running at two different
locations (Plovdiv, Bulgaria and Athens, Greece). These services are
part of two independent implementations of the OpenTox API v1.1 and
they work together flawlessly. Credits go to Pantelis and Nina -- well
done guys!

Detailed statistics are available here:

http://ambit.uni-plovdiv.bg/cgi-bin/smokeping.cgi?target=NTUA.Models.TrainMLR

The configured timeout is 27 seconds. As you can see, in some cases
the MLR model training either needs more time to succeed or simply
fails (see below) and this results in some loss, being recorded by
SmokePing. Obviously there's some room for debugging and further
performance improvement. It might be worth mentioning that the
involved dataset includes 522 records and 10 MLR models are trained
every 5 minutes.

While performing some manual testing I've noticed that from time to
time (only once in a while) the MLR model training fails with a
message like the one below:

- - - - - - - - 8< - - - - - - - -

ambit:/# time curl -iv -X POST -d
'dataset_uri=http://ambit.uni-plovdiv.bg:8080/ambit2/dataset/6&target=http://ambit.uni-plovdiv.bg:8080/ambit2/feature/11954'
http://opentox.ntua.gr:3000/algorithm/mlr
* About to connect() to opentox.ntua.gr port 3000 (#0)
*   Trying 147.102.82.32... connected
* Connected to opentox.ntua.gr (147.102.82.32) port 3000 (#0)
> POST /algorithm/mlr HTTP/1.1
> User-Agent: curl/7.18.2 (x86_64-pc-linux-gnu) libcurl/7.18.2 OpenSSL/0.9.8g zlib/1.2.3.3 libidn/1.8 libssh2/0.18
> Host: opentox.ntua.gr:3000
> Accept: */*
> Content-Length: 122
> Content-Type: application/x-www-form-urlencoded
>
< HTTP/1.1 500 The server encountered an unexpected condition which
prevented it from fulfilling the request
HTTP/1.1 500 The server encountered an unexpected condition which
prevented it from fulfilling the request
< Content-Type: text/plain
Content-Type: text/plain
< Date: Thu, 31 Dec 2009 11:55:43 GMT
Date: Thu, 31 Dec 2009 11:55:43 GMT
< Accept-Ranges: bytes
Accept-Ranges: bytes
< Server: Noelios-Restlet/2.0m3
Server: Noelios-Restlet/2.0m3
< Connection: close
Connection: close
< Transfer-Encoding: chunked
Transfer-Encoding: chunked

<
Error Report.
TimeStamp: Thu Dec 31 06:55:43 EST 2009

Error #1
Exception Details: java.lang.IllegalArgumentException: Can't delete
class attribute
Explanation: Severe Error while trying to build an MLR model.
For debugging reasons we provide a brief list of the exceptions:
- weka.core.Instances.deleteAttributeAt(Unknown Source)
- org.opentox.algorithm.dataprocessing.DataCleanUp.removeStringAtts(DataCleanUp.java:42)
- org.opentox.algorithm.trainer.MlrTrainer.train(MlrTrainer.java:82)
- org.opentox.resource.Algorithm.post(Algorithm.java:143)
- org.restlet.resource.ServerResource.doHandle(ServerResource.java:340)


* Closing connection #0

real    0m2.206s
user    0m0.004s
sys     0m0.004s

I hope this issue wouldn't prove too difficult to be resolved :-)

Kind regards,
Vedrin