Once in a while, you may need to cleanup resources (containers, volumes, images, networks) ...
// see: https://github.com/chadoe/docker-cleanup-volumes
$ docker volume rm $(docker volume ls -qf dangling=true)
$ docker volume ls -qf dangling=true | xargs -r docker volume rm
| """ Trains an agent with (stochastic) Policy Gradients on Pong. Uses OpenAI Gym. """ | |
| import numpy as np | |
| import cPickle as pickle | |
| import gym | |
| # hyperparameters | |
| H = 200 # number of hidden layer neurons | |
| batch_size = 10 # every how many episodes to do a param update? | |
| learning_rate = 1e-4 | |
| gamma = 0.99 # discount factor for reward |
A description of known problems in Satoshi Nakamoto's paper, "Bitcoin: A Peer-to-Peer Electronic Cash System", as well as notes on terminology changes and how Bitcoin's implementation differs from that described in the paper.
The longest chain not only serves as proof of the sequence of events witnessed, but proof that it came from the largest pool of CPU power.
We're looking at CPU bandwidth control via CFS:
Program does number of iterations, in each iteration we burn CPU in small chunks until we get 5ms of real time spent. On each iteration we also print how much
The algorithm that used to be described here is broken.
A better alternative is described here: https://github.com/sipa/writeups/tree/main/elligator-square-for-bn
| #!/usr/bin/env python3 | |
| # Distributed under the MIT software license | |
| import binascii, struct, sys, io, argparse | |
| from PIL import Image | |
| IMG_WIDTH = 512 # could be made adaptive... | |
| MIN_HEIGHT = 4 # minimum height of image; twitter won't let us upload anything smaller | |
| BYTES_PER_PIXEL = 4 # RGBA, 8 bit | |
| def div_roundup(x,y): |
This approach is fairly manual, requires the command line, and requires a patched version of Bitcoin Core.
Note: For this guide, code lines prefixed with $ means that the command is typed in the terminal. Lines without $ are output of the commands.
I am not liable for any coins that may be lost through this method. The software mentioned may have bugs. Use at your own risk.
