Convert a collection of features to a fixed-dimensional matrix using the hashing trick.

Last update: Mar 15, 2022

Overview

FeatureHasher

Convert a collection of features to a fixed-dimensional matrix using the hashing trick.

Note, this requires Jina>=2.2.4.

Example

Here I use FeatureHasher to hash each sentence of Pride and Prejudice into a 128-dim vector, and then use .match to find top-K similar sentences.

from jina import Document, DocumentArray, Flow

# load 
   
d = Document(uri='https://www.gutenberg.org/files/1342/1342-0.txt').convert_uri_to_text()

# cut into non-empty sentences store in a DA
da = DocumentArray(Document(text=s.strip()) for s in d.text.split('\n') if s.strip())

# use FeatureHasher in a Flow
f = Flow().add(uses='jinahub://FeatureHasher')

embed_da = DocumentArray()
with f:
    f.post('/', da, on_done=lambda req: embed_da.extend(req.docs), show_progress=True)

print('self-matching...')
embed_da.match(embed_da, exclude_self=True, limit=5, normalization=(1, 0))
print('total sentences: ', len(embed_da))
for d in embed_da:
    print(d.text)
    for m in d.matches:
        print(m.scores['cosine'], m.text)
    input()

           [email protected][I]:🎉 Flow is ready to use!
	🔗 Protocol: 		GRPC
	🏠 Local access:	0.0.0.0:52628
	🔒 Private network:	192.168.178.31:52628
	🌐 Public address:	217.70.138.123:52628
⠹       DONE ━╸━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━ 0:00:01 100% ETA: 0 seconds 40 steps done in 1 second
total sentences:  12153
The Project Gutenberg eBook of Pride and Prejudice, by Jane Austen

   
     *** END OF THE PROJECT GUTENBERG EBOOK PRIDE AND PREJUDICE ***

    
      *** START OF THE PROJECT GUTENBERG EBOOK PRIDE AND PREJUDICE ***

     
       production, promotion and distribution of Project Gutenberg-tm

      
        Pride and Prejudice

       
         By Jane Austen This eBook is for the use of anyone anywhere in the United States and 
        
          This eBook is for the use of anyone anywhere in the United States and 
         
           by the awkwardness of the application, and at length wholly 
          
            Elizabeth passed the chief of the night in her sister’s room, and 
           
             the happiest memories in the world. Nothing of the past was 
            
              charities and charitable donations in all 50 states of the United

In practice, you can implement matching and storing via an indexer inside Flow. This example is only for demo purpose so any non-feature hashing related ops are implemented outside the Flow to avoid distraction.

Convert a collection of features to a fixed-dimensional matrix using the hashing trick.

Related tags

Overview

FeatureHasher

Example

Owner

Jina AI

RedTeam-Security - In this repo you will get the information of Red Team Security related links

Detection tool of malware(s) by checksum (useful for forensic)

proof-of-concept running docker container from omero web

Glass是一款针对资产列表的快速指纹识别工具，通过调用Fofa/ZoomEye/Shodan/360等api接口

Security offerings for AWS Control Tower

Python directory buster, multiple threads, gobuster-like CLI, web server brute-forcer, URL replace pattern feature.

Get important strings inside [Info.plist] & and Binary file also all output of result it will be saved in [app_binary].json , [app_plist_file].json file

The Multi-Tool Web Vulnerability Scanner.

Searches filesystem for CVE-2021-44228 and CVE-2021-45046 vulnerable instances of log4j library, including embedded (jar/war/zip) packaged ones.

Pre-Auth Blind NoSQL Injection leading to Remote Code Execution in Rocket Chat 3.12.1

LeLeLe: A tool to simplify the application of Lattice attacks.

Course: Information Security with Python

Windows Server 2016, 2019, 2022 Extracter & Recovery

PKUAutoElective for 2021 spring semester

Argument Injection in Dragonfly Ruby Gem

PyExtractor is a decompiler that can fully decompile exe's compiled with pyinstaller or py2exe

DNSpooq - dnsmasq cache poisoning (CVE-2020-25686, CVE-2020-25684, CVE-2020-25685)

S2-062 (CVE-2021-31805) / S2-061 / S2-059 RCE

PortSwigger Burp Plugin for the Log4j (CVE-2021-44228)

🔍 IRIS: An open-source intelligence framework