plyvel | Plyvel , a fast and feature-rich Python interface to LevelDB | Download Utils library
kandi X-RAY | plyvel Summary
kandi X-RAY | plyvel Summary
Plyvel, a fast and feature-rich Python interface to LevelDB
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QUESTION
I have data stored as key value pairs in a leveldb database. The values are the laser vector embedding of sentences and keys are intents of those sentences. When a new sentence is inputted, I compare the vector embedding of that sentence against the values in the leveldb database in order to identify the intent. Here, I have used a nested for loop and this takes more than 5 seconds to execute. Can someone suggest a way to optimize this loop/ code segment?
...expose.py
ANSWER
Answered 2020-Feb-20 at 11:53The only thing I can think of is using numpy for distance calculation (as you already import numpy anyway); I am not sure if this will give you much speedup though.
QUESTION
I am trying to $ sudo pip3 install iconservice as instructed in this tutorial:
https://medium.com/@2infiniti/creating-icon-dapp-from-a-z-part-1-tools-environment-dd56f8dfc905.
I'm running OS-X.
I am receiving the following error message and I am not sure what's going on. I have messed around with cflags as instructed elsewhere but nothing changes.
...ANSWER
Answered 2019-Jun-26 at 02:52It looks like the iconservice package requires libsecp256k to be installed on your system.
QUESTION
What are the top factors to consider when tuning inserts for a LevelDB store?
I'm inserting 500M+ records in the form:
- key="rs1234576543" very predictable structure. rs<1+ digits>
- value="1,20000,A,C" string can be much longer but usually ~ 40 chars
- keys are unique
- key insert order is random
into a LevelDB store using the python plyvel, and see dramatic drop in speed as the number of records grows. I guess this is expected but are there tuning measures I could look at to make it scale better?
Example code:
...ANSWER
Answered 2019-Mar-31 at 15:53(Plyvel author here.)
LevelDB keeps all database items in sorted order. Since you are writing in a random order, this basically means that all parts of the database get rewritten all the time since LevelDB has to merge SSTs (this happens in the background). Once your database gets larger, and you keep adding more items to it, this results in a reduced write throughput.
I suspect that performance will not degrade as badly if you have better locality of your writes.
Other ideas that may be worth trying out are:
- increase the
write_buffer_size - increase the
max_file_size - experiment with a larger
block_size - use
.write_batch(sync=False)
The above can all be used from Python using extra keyword arguments to plyvel.DB and to the .write_batch() method. See the api docs for details.
QUESTION
I'm trying to access leveldbs generated by Chrome storing indexeddbs. I get keys and values. But they are either in an unknown encoding - I've tried many ways to detect them - or they are scrambled in some way.
...ANSWER
Answered 2019-Feb-04 at 18:36you may fake it by passing exactly the same comparator name to a custom comparator in plyvel. that comparator may work differently from the one originally used to create the database. that would get you past the first hurdle i guess.
but since leveldb does not provide a read-only mode of operation, there may be a background thread kicking in to do some compaction while you read the database. and since the comparator is mishaving, this can lead to data loss and destruction of your database.
QUESTION
I am facing a problem with python (2.7) "strings". I am using a LevelDB and want to load an image from the database and save it to disk (e.g., as test.jpeg).
To access the db I am using the plyvel package. I get the img data as follows:
ANSWER
Answered 2018-Mar-28 at 11:49This solved my problem:
QUESTION
I'm following this guide: https://freedomnode.com/blog/69/how-to-install-an-electrum-server-using-full-bitcoin-node-and-electrumx
Currently stuck at this step, to install the pip3 deps Install required Python packages
pip3 install aiohttp pylru leveldb plyvel
After running that command I get the follow error/warnings
...ANSWER
Answered 2018-Feb-23 at 08:28Googling error message finds this https://github.com/peercoin/peercoin/issues/234
It seems your compiling against the system installed leveldb instead of the leveldb in src directory. If possible try uninstalling leveldb from your system (if it is not needed by other applications of course).
I suggest you install leveldb via brew
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Install plyvel
You can use plyvel like any standard Python library. You will need to make sure that you have a development environment consisting of a Python distribution including header files, a compiler, pip, and git installed. Make sure that your pip, setuptools, and wheel are up to date. When using pip it is generally recommended to install packages in a virtual environment to avoid changes to the system.
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