colcarroll / imcmc Goto Github PK

Image Markov Chain Monte Carlo

License: MIT License

Python 100.00%

imcmc's Introduction

It probably makes art.

imcmc (im-sea-em-sea) is a small library for turning 2d images into probability distributions and then sampling from them to create images and gifs. Right now it is best at logos and shape based images.

Installation

This is actually pip installable from git!

pip install git+https://github.com/ColCarroll/imcmc

Quickstart for logos and gifs

See imcmc.ipynb for a few working examples as well.

import imcmc


image = imcmc.load_image('python.png', 'L')

# This call is random -- rerun adjusting parameters until the image looks good
trace = imcmc.sample_grayscale(image, samples=1000, tune=500, nchains=6)

# Lots of plotting options!
imcmc.plot_multitrace(trace, image, marker='o', markersize=10,
                      colors=['#0000FF', '#FFFF00'], alpha=0.9);

# Save as a gif, with the same arguments as above, plus some more
imcmc.make_gif(trace, image, dpi=40, marker='o', markersize=10,
               colors=['#0000FF', '#FFFF00'], alpha=0.9,
               filename='example.gif')

Quickstart for color images

See crosshatch.ipynb for a few working examples as well.

import matplotlib.pyplot as plt

from imcmc.color import (
    ImageLines,
    IntensityMCMCStrategy,
    UniformLinesStrategy,
    GibbsIntensityStrategy
)

pete = plt.imread('color/pete2.jpg')

ImageLines(pete, UniformStrategy()).plot()

munchen = plt.imread('color/munchen.jpg')

ImageLines(munchen, IntensityMCMCStrategy(step_size=500)).plot(10_000)

beach = plt.imread('color/beach.jpg')

ImageLines(beach, UniformLinesStrategy()).plot(1500, linewidth=1)

karwendel = plt.imread('color/karwendel.jpg')

ImageLines(karwendel, GibbsIntensityStrategy()).plot(1_000)

Built with

Pillow does not have a logo, but the other tools do!

Here's a tricky one whose support I appreciate

I get to do lots of open source work for The Center for Civic Media at MIT. Even better, they have a super multi-modal logo that I needed to use 98 chains to sample from!

imcmc's People

Contributors

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Watchers

imcmc's Issues

Example code may be missing `if name == 'main'`

I stumbled upon a multiprocessing error when trying to run the example code and one of the warnings mentioned that could be because there was no if preventing the entry point code to run again and again after a fork.

Wrapping the example code around an if __name__ == '__main__' did the trick.

By the way, this is a very nice project. Thanks for sharing

Not working on my local notebook

Code:

import imcmc
image = imcmc.load_image('my_logo_blk.png', 'L')
trace = imcmc.sample_grayscale(image)

Output:

---------------------------------------------------------------------------
AttributeError                            Traceback (most recent call last)
<ipython-input-16-1ad864fbcc0c> in <module>()
      4 image = imcmc.load_image('novartis_logo_pos_blk.png', 'L')
      5 
----> 6 trace = imcmc.sample_grayscale(image)

~/github/software/imcmc/imcmc/imcmc.py in sample_grayscale(image, samples, tune, nchains, threshold)
    114                           tune=tune,
    115                           chains=nchains, step=pm.Metropolis(),
--> 116                           start=[{'image': x} for x in start],
    117                          )
    118     return trace

~/anaconda/envs/imcmc/lib/python3.6/site-packages/pymc3/sampling.py in sample(draws, step, init, n_init, start, trace, chain, njobs, tune, nuts_kwargs, step_kwargs, progressbar, model, random_seed, live_plot, discard_tuned_samples, live_plot_kwargs, **kwargs)
    283     discard = tune if discard_tuned_samples else 0
    284 
--> 285     return sample_func(**sample_args)[discard:]
    286 
    287 

~/anaconda/envs/imcmc/lib/python3.6/site-packages/pymc3/sampling.py in _sample(draws, step, start, trace, chain, tune, progressbar, model, random_seed, live_plot, live_plot_kwargs, **kwargs)
    330     try:
    331         strace = None
--> 332         for it, strace in enumerate(sampling):
    333             if live_plot:
    334                 if live_plot_kwargs is None:

~/anaconda/envs/imcmc/lib/python3.6/site-packages/tqdm/_tqdm.py in __iter__(self)
    951 """, fp_write=getattr(self.fp, 'write', sys.stderr.write))
    952 
--> 953             for obj in iterable:
    954                 yield obj
    955                 # Update and possibly print the progressbar.

~/anaconda/envs/imcmc/lib/python3.6/site-packages/pymc3/sampling.py in _iter_sample(draws, step, start, trace, chain, tune, model, random_seed)
    409         update_start_vals(start, strace.point(-1), model)
    410     else:
--> 411         update_start_vals(start, model.test_point, model)
    412 
    413     try:

~/anaconda/envs/imcmc/lib/python3.6/site-packages/pymc3/util.py in update_start_vals(a, b, model)
    143                             a[name], point=b).eval()
    144 
--> 145     a.update({k: v for k, v in b.items() if k not in a})
    146 
    147 

AttributeError: 'list' object has no attribute 'update'

Error: AttributeError: module 'theano' has no attribute 'Op'

I was trying to use your 'imcmc' package but am running into few challenges. I am not able to run the test files as well.

Error: AttributeError: module 'theano' has no attribute 'Op'

I was hoping if you could help me out with the same.

Problem with pymc3 3.3

The last days I have been playing with pymc3, and found this error:
pymc-devs/pymc#3068

I had to install the latest version available in their repo to solve the issue (it's 3.4.1 available in master).

When I installed your package, pip installed pymc3 3.3 as required in requirements.txt. So my pymc3 was downgraded. When I run your getting started example, I got the error above again.

I have upgraded pymc3 again to the bleeding edge version, and I could run your example.

My suggestion is that you update the requirements.txt.

colcarroll / imcmc Goto Github PK

imcmc's Introduction

Installation

Quickstart for logos and gifs

Quickstart for color images

Built with

Here's a tricky one whose support I appreciate

imcmc's People

Contributors

Stargazers

Watchers

Forkers

imcmc's Issues

Example code may be missing `if name == 'main'`

Not working on my local notebook

Error: AttributeError: module 'theano' has no attribute 'Op'

Problem with pymc3 3.3

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