Migrate faiss search migrate to jina 0.4.1

[bwanglzu]

This PR was aligned with issue #116 , migrate faiss search example for Jina 0.4.1 release, includes:

1. Code migration based on migration guide.
2. Minor changes on Readme.

To run this example, you should build faiss image locally using jina 0.4.1 with Dockerfile:

FROM conda/miniconda3-centos7:latest

WORKDIR /

RUN conda update -n base conda && \
    conda install -y -c pytorch faiss-cpu

COPY faiss.yml .

RUN conda install pip
RUN pip install jina==0.4.1

ENTRYPOINT ["jina", "pod", "--uses", "faiss.yml"]

And run command:

docker build -f Dockerfile -t jinaai/hub.executors.indexers.vector.faiss:latest .

[JoanFM]

@nan-wang should we merge this example?

[bwanglzu]

@JoanFM one moment, let me test again

[JoanFM]

I proposed change in #138.

When I created this example, I wanted to have a dummy encoder and crafter to showcase a much more common pattern than simply index. It may be able to work directly against the Index.

[JoanFM]

With the new recursive document, this example should be refactored to use only 0-depth-level. We can do it in the future

[YueLiu1415926]

Made some small changes in #139. I included the dockerfile folder into the example, otherwise COPY faiss.yml . on line 8 will show an error.

[bwanglzu]

@YueLiu-jina @JoanFM I saw your PRs, thanks for that.How we are going to proceed?

[JoanFM]

@YueLiu-jina @JoanFM I saw your PRs, thanks for that.How we are going to proceed?

You can merge both into your branch!

[JoanFM]

See comment #138 (comment)
Tested it locally, it worked. 2 points to be noted:

1. Use jina 0.4.1 (or github master branch) to build docker image.
2. Clean up workspace before you index and query.

lgtm!

[JoanFM]

LGTM!

[bwanglzu]

@YueLiu-jina can you resolve the conflict? Then I'll test again

[YueLiu1415926]

@bwanglzu Merged my branch, I'll give it a test again

[JoanFM]

Still works?

[YueLiu1415926]

it works well, I think this PR is ready to merge

[JoanFM]

@YueLiu-jina, it prints results? can u post a screenshot of what u get in query output? just double checking

[YueLiu1415926]

Is this the effect we want?

[JoanFM]

Good to merge then!