Evaluation

Terrier uses jtreceval to provide the evaluation of standard retrieval runs. jtreceval contains trec_eval compiled to run under various standard platforms (e.g. Windows/Linux/Mac x86). For unsupported platforms, Terrier also includes a legacy Java evaluation package for evaluating results of TREC adhoc and named-page finding tasks.

Before running an evaluation, we need to specify the relevance assessments file in the property trec.qrels. To evaluate all .res result files in folder var/results, we can type the following:

bin/terrier batchevaluate

The batchevaluate command evaluates each .res file in folder var/results using trec_eval. We can evaluate for a particular result file by giving the filename in the command line:

bin/terrier batchevaluate -e InL2c1.0_0.res

or

bin/trec_terrier.sh -e ./var/results/InL2c1.0_0.res

The above command evaluates only ./var/results/InL2c1.0_0.res. For a result file named x.res, the evaluation result is saved in file x.eval, which contains the content as shown in the following example:

runid all InL2c1.0 num_q all 93 num_ret all 91930 num_rel all 2083 num_rel_ret all 1941 map all 0.2948 gm_map all 0.1980 Rprec all 0.2998 bpref all 0.9359 recip_rank all 0.7134 iprec_at_recall_0.00 all 0.7376 iprec_at_recall_0.10 all 0.6431 iprec_at_recall_0.20 all 0.5232 iprec_at_recall_0.30 all 0.4079 iprec_at_recall_0.40 all 0.3424 iprec_at_recall_0.50 all 0.2710 iprec_at_recall_0.60 all 0.2028 iprec_at_recall_0.70 all 0.1555 iprec_at_recall_0.80 all 0.1075 iprec_at_recall_0.90 all 0.0607 iprec_at_recall_1.00 all 0.0245 P_5 all 0.4667 P_10 all 0.3677 P_15 all 0.3097 P_20 all 0.2747 P_30 all 0.2394 P_100 all 0.1285 P_200 all 0.0789 P_500 all 0.0382 P_1000 all 0.0209

The above displayed evaluation measures are averaged over a batch of queries. We can obtain per-query results by using option -p in the command line:

bin/terrier batchevaluate -e PL2c1.0_0.res -p

The resulting output saved in the corresponding .eval file will contain further results, with the middle column indicating the query id.

Using trec_eval directly

Terrier ships with treceval, which contains trec_eval binaries that work on Linux x86/x8664, Mac OS X x8664 and Windows x86. You can therefore use easily trec_eval directly from the command line, by invoking the trec_eval.sh script:

```shell

bin/terrier treceval /path/to/qrels var/results/PL2c1.00.res

```


Webpage: http://terrier.org
Contact: School of Computing Science
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