How to implement Snapshot Isolation correctly and tempdb issues?

The Snapshot Isolation feature helps us to solve the problem where readers lock out writers on high volume sites. It does so by versioning rows using tempdb in SqlServer. My question is to...

How to do ray tracing in modern OpenGL?

So I'm at a point that I should begin lighting my flatly colored models. The test application is a test case for the implementation of only latest methods so I realized that ideally it should be...

How to Iterate on a cache entries

I am using Spring3.1 in standalone Env. I am caching my entry using @Cachable annotation. Sometimes I need to iterate on the caching list in order to get specific value(not key). So I managed to...

How do I initialize the t-variables in "A Fast Voxel Traversal Algorithm for Ray Tracing"?

I am trying to implement the algorithm explained on this paper, used to traverse grid cells in order following a straight line, which is useful for ray...

Mouse / Canvas X, Y to Three.js World X, Y, Z

I've searched around for an example that matches my use case but cannot find one. I'm trying to convert screen mouse co-ordinates into 3D world co-ordinates taking into account the...

three.js - principle of camera collision

As I understood the only method to compute collisions with three.js is intersectObjects with a ray ... I created an object that includes the basic elements of the collision : ground, walls,...

How can I access a Collider's GameObject in script?

I am making a card game in Unity3d. I created cards as game objects programmatically using c#. I wanted to know how to make each objects(cards) to move on mouse button click, i tried out with...

Is it not possible to stringify an Error using JSON.stringify?

Reproducing the problem I'm running into an issue when trying to pass error messages around using web sockets. I can replicate the issue I am facing using JSON.stringify to cater to a wider...

Numpy arrays in C

I've only just started C and am trying to make a backend for my python. At the moment I have a cumbersome system of writing huge input files (at least 10^6 floats) from the python then...

Three js How to move scene

I would like to move the container (which contains my 3d objects) Could you tell me how? I am using Three JS THREE.DragControls = function(camera, scene, domElement) { this.childs =...

POV-ray scripts rendering just in black

Some POV-ray scripts just give me a blank black screen whilst others run fine. Below is an example (originally written by Steve Waterman) of a scene that just gives me a blank black...

How do I perform GET and POST requests in Swift?

I adapted this from Ray Wenderlich's iOS Apprentice tutorial part 4. This code works as a GET request sent to my Strongloop API with a simple database model, however: This works, but I don't know...

Surface Area Heuristic (SAH) kd-tree of triangles - flat cells

I've implemented a SAH kd-tree based upon the paper On building fast kd-Trees for Ray Tracing, and on doing that in O(N log N) by Wald and Havran. Note I haven't done their splicing and merging...

FFprobe command in a var in IF statement

I am trying to set up a batch file (currently testing in CMD prompt) to run when there is a change in the directory. I have a command stored in a variable "test" which tells me what the first...

GET request works in browser but not in POSTMAN - Cloudfare denies it

I am trying to access the following API and this is the behavior API = https://api.btcxindia.com/ticker/ While accessing this API from Postman , I get the output. However, if I leave my postman...

Mount S3 bucket as filesystem on AWS ECS container

I am trying to mount S3 as a volume on AWS ECS docker container using rexray/s3fs driver. I am able to do this on my local machine, where I installed plugin $docker plugin install...

Parallel: Import a python file from sibling folder

I have a directory tree working_dir\ main.py my_agent\ my_worker.py my_utility\ my_utils.py Code in each file is as follows """ main.py """ import os,...

Flow-Project tutorial 04 visualizer_rllib.py error

I am new to flow and working through the examples. In tutorial 04 visualize example I get an attribute error. The code in the cell is !python ../flow/visualize/visualizer_rllib.py...

How do you compile OpenCV with cmake?

I'm trying to compile OpenCV so that it has the the sift module. I downloaded CMake using this tutorial. I also downloaded and unzipped opencv-4.3.0 and opencv_contrib. I made an empty folder,...

Use an existing EBS volume with the Docker REX-Ray plugin on ECS

I'm using Terraform to create an ECS Cluster, a task definition and a service. For task definition, the piece of code looks like this: resource "aws_ecs_task_definition" "postgres" { ...

How to explicitly release object after creating it with `ray.put`?

I'm trying to get rid of object pinned in shared memory using ray.put. Here is code sample: import ray <create obj> for ...: obj_id = ray.put(obj) <do stuff with obj_id on ray Actors using...

Can't install grpcio on Ubuntu 18.04 with Python 3.7.5?

I am using Python 3.7.5 on Ubuntu 18.04. Trying to install ray and tensorflow packages but getting errors installing one of the dependencies packages grpcio. Command "/usr/bin/python3 -u -c...

Executing ray on distributed computing

I have data on a server that I have made on a virtualbox and i have a grpc server there. On my local machine, I have created a grpc client that sends a class instance to the server, the server...

Ray init() is very slow

I am new at using Ray, I find it wonderful, I had to divest from multiprocessing because it was not working optimally inside a class. My only issue with Ray, and I don't understand it, is that for...

Accessing rexray/ebs volume from ECS host

I've managed to follow https://aws.amazon.com/blogs/compute/amazon-ecs-and-docker-volume-drivers-amazon-ebs/ and run my Container-based service on ECS using rex-ray Docker volume plugin. I can...

bot.run('TOKEN') stopped working - discord.py

been using discord.py for well over 6 months and this is the first time I've encountered this error. This is my code (removed irrelevant commands, still gives this issue): import discord import...

php curl access to website with cloudflare 2021

I have been parsing sites for years using curl, but i'm having some unknown stuff about a website. Checking what ir returns it uses cloudfires and investigating about it i saw that it use some...

How do I invoke a SAM Lambda function locally with X-Ray statements?

I'm receiving the following error when invoking an AWS SAM Lambda function locally: Missing AWS Lambda trace data for X-Ray. Ensure Active Tracing is enabled and no subsegments are created outside...

Ray[tune] for pytorch TypeError: ray.cloudpickle.dumps

I am having trouble getting started with tune from Ray. I have a PyTorch model to be trained and I am trying to fine-tune using this library. I am very new to Raytune so please bear with me and...

How can I import a ray rllib pytorch whole model into next round training and subsquent inference using torch save load method other than checkpoints

In ray rllib, I usually apply ray.tune.run a ppo trainning like this: ray.init(log_to_driver=False, num_cpus=3, local_mode=args.local_mode, num_gpus=1) env_config={"code":"codeA"} config={ ...