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@joschu
joschu / 1-trpo-gae-v0-writeup.md
Last active April 20, 2024 17:30
TRPO-GAE (Version 0) Writeup

Code used to obtain these results can be found at the url https://github.com/joschu/modular_rl, commit 50cdfdf375e69d86e3db6eb2ad0218ea6aebf371. The command line expression used for all the environments can be found in the text file below. Note that the same exact parameters and policies were used for all tasks, except for timesteps_per_batch, which was varied based on the difficulty of the task. The important parameters are:

  • gamma=0.995: discount
  • lam=0.97: see GAE paper for explanation
  • agent=TrpoAgent: name of the class, which specifies policy and value function architecture. In this case, we used two hidden layers of size 64, with tanh activations
  • cg_damping: multiple of the identity added for conjugate gradient
@karpathy
karpathy / min-char-rnn.py
Last active October 23, 2025 16:55
Minimal character-level language model with a Vanilla Recurrent Neural Network, in Python/numpy
"""
Minimal character-level Vanilla RNN model. Written by Andrej Karpathy (@karpathy)
BSD License
"""
import numpy as np
# data I/O
data = open('input.txt', 'r').read() # should be simple plain text file
chars = list(set(data))
data_size, vocab_size = len(data), len(chars)
@OlegIlyenko
OlegIlyenko / NotNothing.scala
Created January 19, 2014 18:35
Advanced Type Constraints with Type Classes.
import scala.reflect.runtime.universe.TypeTag
import scala.annotation.implicitNotFound
@implicitNotFound("Sorry, type inference was unable to figure out the type. You need to provide it explicitly.")
trait NotNothing[T]
object NotNothing {
private val evidence: NotNothing[Any] = new Object with NotNothing[Any]
implicit def notNothingEvidence[T](implicit n: T =:= T): NotNothing[T] =
@umpirsky
umpirsky / A.markdown
Last active August 3, 2023 18:14 — forked from olivierlacan/An_example.markdown
Sublime Text Monokai Sidebar Theme.
@isaacs
isaacs / node-and-npm-in-30-seconds.sh
Last active October 23, 2025 07:56
Use one of these techniques to install node and npm without having to sudo. Discussed in more detail at http://joyeur.com/2010/12/10/installing-node-and-npm/ Note: npm >=0.3 is *safer* when using sudo.
echo 'export PATH=$HOME/local/bin:$PATH' >> ~/.bashrc
. ~/.bashrc
mkdir ~/local
mkdir ~/node-latest-install
cd ~/node-latest-install
curl http://nodejs.org/dist/node-latest.tar.gz | tar xz --strip-components=1
./configure --prefix=~/local
make install # ok, fine, this step probably takes more than 30 seconds...
curl https://www.npmjs.org/install.sh | sh