scalable

efficient way of constructing a matrix of pair-wise distances between many vectors?

由 限于喜欢 提交于 2021-02-11 08:10:37
问题 First, thanks for reading and taking the time to respond. Second, the question: I have a PxN matrix X where P is in the order of 10^6 and N is in the order of 10^3. So, X is relatively large and is not sparse. Let's say each row of X is an N-dimensional sample. I want to construct a PxP matrix of pairwise distances between these P samples. Let's also say I am interested in Hellinger distances. So far I am relying on sparse dok matrices: def hellinger_distance(X): P = X.shape[0] H1 = sp.sparse

High performance TCP server in C#

由 做~自己de王妃 提交于 2019-12-27 16:23:53
问题 I am an experienced C# developer, but I have not developed a TCP server application so far. Now I have to develop a highly scalable and high performance server that can handle at least 5-10 thousand concurrent connections: getting -raw byte- data via GPRS from GPS devices. A common communication process should look like this: GPS device initiates a connection to my server my server answers if I want to get data device send GPS data my server sends report to the device about getting it (sg

SVD algorithm implementation

由 我们两清 提交于 2019-12-23 15:59:33
问题 Does anyone know good scalable implementation of SVD on C# for very big matrix? 回答1: ILNumerics.net seems to have SVD among other things. Feature list: Frameworks .NET 1.1, .NET 2.0, available soon: mono 1.2.3 Languages all CLI conform: C# (recommended), managed C++, Visual Basic ... Array objects * Full OO class design * Generic typed container classes * single object for arbitrary array dimensions: scalar, vector, matrices, n-dim arrays * full support for flexible array modification:

CSS or jQuery scalable background image with NO white space underneath when img height is less than window height

由 不羁岁月 提交于 2019-12-14 00:57:33
问题 Oldie but goodie, I know. This question is asked so many times and yet I haven't had a definitive answer. Scalable background image, preferably CSS only, willing to use jQuery in support if it's a must. A problem I've run into a lot (i.e. with CSS3 background-image) is empty space underneath an image when it's height is less than the browser windows height. (example: http://css-tricks.com/examples/ImageToBackgroundImage/) Here's what I'd like to accomplish: Maintain aspect ratio Clip image

Fast write performance, even if reads are very slow

由 为君一笑 提交于 2019-12-13 06:40:16
问题 Sorry if there's already an answer for this, I searched for it and I didn't find exactly my scenario. Once again is a question like "What is the fastest/best performance DB?". But since the answer depends on the scenario, my scenario is this: I want to write many logs to DB, thousands per second. But I will not read them often. Indeed 99,99% of them will never be read again, but once in a while I will need to read. Schema is not complex, just key/value. Once in a while I will read by value

Scalable Server to listen to POST messages

由 我是研究僧i 提交于 2019-12-13 04:55:01
问题 I have a python Flask listener waiting on port 8080.I expect a client to POST documents to this listener. #!/usr/bin/env python2 from __future__ import print_function from flask import Flask, request from flask.ext.cors import CORS from datetime import datetime import os, traceback, sys import json import os app = Flask('__name__') cors = CORS(app) @app.route('/',methods=['GET','POST','OPTIONS']) def recive_fe_events(): try: data = request.get_data() if request.content_length < 20000 and

Openshift Scalable Rails 4 new application renders 503 Server Unavailable

由 梦想的初衷 提交于 2019-12-11 11:54:59
问题 I successfully deployed a rails single gear application on openshift a few months ago. I am now attempting to deploy a scalable application. After setting up the app, connecting with git, pushing a minimalist project to openshift, I am getting a 503 Server Unavailable error. After doing quite a bit of research, I speculate my problem may be related to the HAProxy. The following post here goes into some detail about the haproxy and dealing with the cfg. I do have the same DOWN gears for my

Ajax - best practice/approach for loading tertiary data

由 孤人 提交于 2019-12-10 12:23:53
问题 I'm having some difficulty on settling on an approach for loading additional data in an application that I am building. The app is a CMS in which a single page consists of many fragments--some reusable, others exclusive. An example of an exclusive fragment might be a description/author meta tag, whereas a reusable fragment might be a list of links. My current approach is to load the essential data that makes up the bulk of the page, e.g. Main body content, title,slug, dates (publish

Scripting <path> data in SVG (reading and modifying)

由 泪湿孤枕 提交于 2019-11-27 06:25:34
Can anyone really really help me, please? I've been searching for ways to run scripts for my SVG. But all the things i got doesn't match up! And it doesn't contain enough information why he used that set of codes. For example, one used event.target, another had event.getTarget(), and another had event.target.firstchild.data. Can anyone help me, please? <svg xmlns="http://www.w3.org/2000/svg" version="1.1"> <path d="M150 0 L75 200 L225 200 Z" /> </svg> is an example of a path svg right? What i need is to get those coordinates, probably put it in a variable, and use it as coordinates for another

High performance TCP server in C#

由 二次信任 提交于 2019-11-26 21:23:20
I am an experienced C# developer, but I have not developed a TCP server application so far. Now I have to develop a highly scalable and high performance server that can handle at least 5-10 thousand concurrent connections: getting -raw byte- data via GPRS from GPS devices. A common communication process should look like this: GPS device initiates a connection to my server my server answers if I want to get data device send GPS data my server sends report to the device about getting it (sg like checksum) getting new data from GPS, reportm and this happens again and again later GPS DEVICE closes
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