Lewin Bormann dermesser

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a bit of time :-)

118 followers · 12 following

Zurich Instruments AG
Zürich, Switzerland
https://lewinb.net

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dermesser / mnist_autoencoder.jl

Created February 26, 2022 12:50

MNIST autoencoder network with ~251k weights in Flux.jl, running on CPU and GPU.

	using MKL
	using CUDA
	import Flux
	import MLDatasets
	import Images
	import BSON: @load,@save
	import NNlib
	using Dates

	function logn(args...)

dermesser / lazyloader.jl

Last active February 26, 2022 12:51

LazyLoader: A Julia utility to lazily load images from disk for use in e.g. Flux for machine learning. Can be used as replacement for Flux.DataLoader if the dataset is too large for memory.

	import Glob
	import CUDA: CuArray
	import Images
	import Flux: gpu
	import Flux

	using Dates

	function logn(args...)
	println(now(), " ", args...)

dermesser / mst.ipynb

Created February 15, 2022 08:12

Three different implementations for minimum spanning trees in Gurobi

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dermesser / manybody.jl

Last active January 7, 2022 19:30

Trivial n-body simulation.

	using DifferentialEquations
	using Plots


	# Many-body, 2D.

	const F = Float64
	const D = 2
	const G = 6.6743e-11 # m³/kg s²

dermesser / lattice2d.jl

Last active January 5, 2022 20:19

Simple 2D lattice dynamics calculation for a cubic structure with next-neighbor coupling only. Example: https://borgac.net/~lbo/asset/jl_62ec52.gif. Eigenmmodes: https://borgac.net/~lbo/asset/eigenmodes_5x5/

	# (c) 2022 Lewin Bormann
	# Full and updated code at https://borgac.net/lbo/hg/lattice2d/

	using Plots
	using DifferentialEquations
	import LinearAlgebra

	using SparseArrays

	theme(:juno)

dermesser / linearchain.jl

Last active January 5, 2022 20:19

Solve a chain of harmonic oscillators using Julia's DifferentialEquations package. This is fairly easy using matrix calculations. Anharmonic terms in 3rd order can be included, too. Example (7 particles, first is displaced at t=0, anharmonic term: k/2 x^2 - 0.1 x^3): https://borgac.net/~lbo/asset/lc7.png

	# (c) 2022 Lewin Bormann
	# Have fun!
	# Full and update code at https://borgac.net/lbo/hg/lattice2d/


	import LinearAlgebra
	using DifferentialEquations
	using Plots
	theme(:juno)

dermesser / paramagnet.pluto.jl

Created December 30, 2021 15:50

A simple paramagnetic annealing notebook.

	### A Pluto.jl notebook ###
	# v0.17.2

	using Markdown
	using InteractiveUtils

	# ╔═╡ 8513f9b6-6973-11ec-35d7-cbf5183ebc84
	begin
	import Plots
	using Random

dermesser / tsp_annealing.jl

Last active December 29, 2021 19:55

TSP Annealing: A simple tuneable implementation of solving Travelling Sales Person using Simulated Annealing, including a MIP program to check against the provably optimal version. Often a lot faster than a (naive) MIP implementation. Annealing process shown here: https://youtu.be/KhLE6YKeTqg

	### A Pluto.jl notebook ###
	# v0.17.2

	using Markdown
	using InteractiveUtils

	# ╔═╡ 5c207166-67e2-11ec-192d-0debd3bc8e59
	begin
	import Plots
	import JuMP

dermesser / lv.py

Last active December 23, 2021 10:06

Lotka-Volterra automatically differentiated using tensorflow.

	import numpy as np
	import tensorflow as tf


	def LV(N1, N2, eps1, eps2, gam1, gam2):
	dt = tf.constant(1.)
	states = [(N1, N2)]
	for i in range(1, 13):
	states.append((states[i-1][0] + (states[i-1][0] * (eps1-gam1states[i-1][1])) dt, states[i-1][1] - states[i-1][1] * (eps2-gam2states[i-1][0])) dt)
	return states[-1]

dermesser / miniautodiff.py

Last active December 22, 2021 17:28

A very simple reverse-mode automatic differentiation in Python for demo purposes.

	import numpy as np

	class Expression:
	def __init__(self, left, right):
	self.l = left
	self.r = right

	self.eval_l = None
	self.eval_r = None

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