Exception in BM25 run

[oussaidene]

Hi, i'm trying to use Pyserini fr the first time. And i have encountered this exception while running the BM25 baseline on the MS MARCO passage ranking task with the code provided in the instalation guide:

python -m pyserini.search --topics msmarco-passage-dev-subset --index msmarco-v1-passage --output run.ms
marco-passage.txt --output-format msmarco --bm25
Traceback (most recent call last):
File "C:\Users\smail\anaconda3\lib\runpy.py", line 185, in _run_module_as_main
mod_name, mod_spec, code = _get_module_details(mod_name, _Error)
File "C:\Users\smail\anaconda3\lib\runpy.py", line 144, in _get_module_details
return _get_module_details(pkg_main_name, error)
File "C:\Users\smail\anaconda3\lib\runpy.py", line 111, in get_module_details
import(pkg_name)
File "C:\Users\smail\anaconda3\lib\site-packages\pyserini\search_init.py", line 17, in
from .base import JQuery, JQueryGenerator, JDisjunctionMaxQueryGenerator, get_topics,
File "C:\Users\smail\anaconda3\lib\site-packages\pyserini\search_base.py", line 26, in
from pyserini.pyclass import autoclass
File "C:\Users\smail\anaconda3\lib\site-packages\pyserini\pyclass.py", line 27, in
from jnius import autoclass, cast
File "C:\Users\smail\anaconda3\lib\site-packages\jnius_init.py", line 42, in
raise Exception("Unable to create jni env, no jvm dll found.")
Exception: Unable to create jni env, no jvm dll found.

[lintool]

Looks like you don't have the JVM installed... please follow our instructions here:
https://github.com/castorini/pyserini/blob/master/docs/installation.md

[oussaidene]

Thanks for the reply!

I have JVM installed though:

java --version
java 11.0.7 2020-04-14 LTS
Java(TM) SE Runtime Environment 18.9 (build 11.0.7+8-LTS)
Java HotSpot(TM) 64-Bit Server VM 18.9 (build 11.0.7+8-LTS, mixed mode)

[lintool]

However, based on your error:

...
File "C:\Users\smail\anaconda3\lib\site-packages\jnius_init.py", line 42, in
raise Exception("Unable to create jni env, no jvm dll found.")
Exception: Unable to create jni env, no jvm dll found.

Python appears to be unable to find the JVM.

[MXueguang]

I usually use conda install -c conda-forge openjdk=11 to deal with java environment in pyserini

[oussaidene]

I ended up unistalling my JVM and reinstalled it with pyserini, and it works prefectly fine now!