el-hult’s gists

el-hult / day4.html

Last active December 27, 2018 14:06

advent of code 2017 day 4 html page.

	<!doctype html><html><head><meta charset="utf-8"/><script>

	const isValid = raw => {
	const words = raw.split(/\s+/)
	// writeToBody("raw: " + raw)
	// writeToBody("words: " + words)
	const checker = (prevAcc, nextWord) => {
	const acc = { set: prevAcc.set, count: prevAcc.count };
	if( acc.set.has(nextWord) ) { acc.count = acc.count + 1 }
	else { acc.set.add(nextWord) }

el-hult / gameOfLife.hs

Created May 7, 2019 19:37

1D Game of Life in the terminal

	-- http://blog.sigfpe.com/2006/12/evaluating-cellular-automata-is.html
	-- The above post learned me about this neat comonad instance! :D

	data U x = U [x] x [x]

	right,left:: U x -> U x -- shift focus of the zipper
	right (U a b (c:cs)) = U (b:a) c cs
	left (U (a:as) b c) = U as a (b:c)

	-- the zipper is a functor

el-hult / comonadVectorDiff.hs

Created May 7, 2019 19:46

Finding right angles between 2D vectors using comonads

	-- This is using a haskell comonad to find right angles between given geometrical vectors
	-- The code is kind of overkill, but it is a cute showcase of comonads


	-- a FocusSet. One element in Focus, and all other elements in a list.
	data Fs a = Fs a [a] deriving (Show)

	instance Functor Fs where
	fmap fun (Fs k l) = Fs (fun k) (map fun l)

el-hult / comonadVectorDiff.hs

Created May 7, 2019 19:46

Finding right angles between 2D vectors using comonads

	-- This is using a haskell comonad to find right angles between given geometrical vectors
	-- The code is kind of overkill, but it is a cute showcase of comonads


	-- a FocusSet. One element in Focus, and all other elements in a list.
	data Fs a = Fs a [a] deriving (Show)

	instance Functor Fs where
	fmap fun (Fs k l) = Fs (fun k) (map fun l)

el-hult / typed_currencies_37.py

Last active August 22, 2019 19:22

An example on how one can use the typings module to make currency conversion work like a charm. The code uses only python 3.7 features.

	import urllib.request
	import json
	import typing
	import functools


	SEK = typing.NewType('SEK',float)
	EUR = typing.NewType('EUR', float)
	ConversionRate = typing.NewType('ConversionRate',float)
	ThreeLetterCurrencyCode = str # ISO4217

el-hult / Gelman2.13.ipynb

Last active September 8, 2019 20:48

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el-hult / random_variables.py

Created September 23, 2019 10:25

Some classes for random variables, in a Pythonic way with inheritance. Fun way to make universal random number generation. Might be inefficient, but still very cool.

	# standards
	from abc import ABC
	from itertools import islice
	from collections import Counter
	import types

	# 3rd party
	import numpy as np
	import scipy.stats as stats
	import matplotlib.pyplot as plt

el-hult / random_variables_monkeypatch.py

Created September 23, 2019 10:27

A monkay-patching way to create random variables with overloaded plus operator. Not a pythonic way to do it, since monkey patching is generally frowned upon.

	# standards
	from itertools import islice
	import types

	# 3rd party
	import numpy as np


	class RandomVariable():
	def __iter__(self):

el-hult / batchnorm1d_nf.py

Last active February 25, 2021 08:15

See https://el-hult.github.io/2021/02/25/invertible-normalizer.html

	class MemorizingNormalizer(nn.Module):
	def __init__(self, d, eps, rho):
	super().__init__()
	self.means = nn.Parameter(torch.zeros(d), requires_grad=False)
	self.vars = nn.Parameter(torch.ones(d), requires_grad=False)
	self.eps = nn.Parameter(torch.tensor(eps, dtype=float), requires_grad=False)
	self.rho = nn.Parameter(torch.tensor(rho, dtype=float), requires_grad=False)

	def forward(self, x):
	self.means.data = self.means * self.rho + (1 - self.rho) * x.mean(axis=0)

el-hult / cals2tiff.py

Last active June 13, 2021 20:49

Code for converting a CALS raster file to TIFF. Using vanilla Python.

	"""

	Python script that takes a folder, and for each CALS Raster file, it converts to a TIFF file.

	https://en.wikipedia.org/wiki/CALS_Raster_file_format

	file ending ".cal"

	It so happens that TIFF can be compressed with Group 4 compression (as in faxes), and that is the compression format of CALS Raster images Type 1.

Ludvig Hult el-hult