Update README.md

README.md

@@ -14,25 +14,46 @@ viewer: false
 
 ## Description
 
-*TODO: What is the artifact?*
+A PISA index for the NFCorpus dataset
 
 ## Usage
 
 ```python
 # Load the artifact
 import pyterrier as pt
-artifact = pt.Artifact.from_hf('pyterrier/nfcorpus.pisa')
-# TODO: Show how you use the artifact
+index = pt.Artifact.from_hf('pyterrier/nfcorpus.pisa')
+index.bm25() # returns a BM25 retriever
 ```
 
 ## Benchmarks
 
-*TODO: Provide benchmarks for the artifact.*
+`nfcorpus/dev`
+
+| name   |   nDCG@10 |   R@1000 |
+|:-------|----------:|---------:|
+| bm25   |    0.2933 |   0.3299 |
+| dph    |    0.2912 |   0.334  |
+
+`nfcorpus/test`
+
+| name   |   nDCG@10 |   R@1000 |
+|:-------|----------:|---------:|
+| bm25   |    0.3271 |   0.3685 |
+| dph    |    0.3222 |   0.3672 |
+
 
 ## Reproduction
 
 ```python
-# TODO: Show how you constructed the artifact.
+import pyterrier as pt
+from tqdm import tqdm
+import pandas as pd
+import ir_datasets
+from pyterrier_pisa import PisaIndex
+index = PisaIndex("nfcorpus.pisa", threads=16)
+dataset = ir_datasets.load('beir/nfcorpus')
+docs = ({'docno': d.doc_id, 'text': d.default_text()} for d in tqdm(dataset.docs))
+index.index(docs)
 ```
 
 ## Metadata