Skip to main content

A class to represent a Bayes Network. And apply all the different sampling strategies to the calculate a given query.

Project description

Bayes Nets and Sampling

About:

Developed code from scratch to compute an input probability query on a given Bayes net on discrete random variables using Prior sampling, Rejection Sampling, Likelihood weighting and Gibbs sampling.
I had also written helper function to generate samples from any input univariate discrete distribution and then use it in your Bayes Net sampling code.

BayesNets Class:

I implemented a BayesNets Class to do all the required task and computations.
Basically I created a single class to do all the calculation, extractions of details from the file as well as implement all the sampling methods and sample generation.

Install the Python Package

pip install bayes-nets-sample

Import the Python Package

from bayes import bayesNets

To see the Sample .txt file

from bayes.sample_input_txt import SampleInputTXT
SampleInputTXT().generate_sample()

To Get more information about the BayesNets Class as well as its methods:

run the following command:

help(BayesNets)

Lets Start By Creating an object of BayesNets and extract the information from the file:

bayesNet = BayesNets(filepath = "example_bayesnet.txt")

Let's Print The Extracted Information:

print(bayesNet)

Let's See how a single sample is generated:

bayesNet.generateSample()

Now Lets Calculate the Query result using Prior Sampling Method:

With verbose = True

bayesNet.doPriorSampling(TOTAL_SAMPLE = 10000, verbose = True)

Now Lets Calculate the Query result using Prior Sampling Method:

With verbose = False

  • Just to see the final result.
bayesNet.doPriorSampling(TOTAL_SAMPLE = 10000, verbose = False)

Now Lets Calculate the Query result using Rejection Sampling Method:

With verbose = True

bayesNet.doRejectionSampling(TOTAL_SAMPLE_REQUIRED = 10000, verbose = True)

Now Lets Calculate the Query result using Rejection Sampling Method:

With verbose = False

  • Just to see the final result.
bayesNet.doRejectionSampling(TOTAL_SAMPLE_REQUIRED = 10000, verbose = False)

Let's See how a single weighted sample is generated:

bayesNet.generateWeightedSample(verbose = True)

Now Lets Calculate the Query result using Likelihood Weighting Method:

With verbose = True

bayesNet.doLikelihoodWeighting(TOTAL_SAMPLE = 10000, verbose = True)

Now Lets Calculate the Query result using Likelihood Weighting Method:

With verbose = False

  • Just to see the final result.
bayesNet.doLikelihoodWeighting(TOTAL_SAMPLE = 10000, verbose = False)

Sample File

5, B, E, A, J, M
B, +b, -b
E, +e, -e
A, +a, -a
J, +j, -j
M, +m, -m
B |
+b, 0.001
-b, 0.999
E |
+e, 0.002
-e, 0.998
A | B,E
+b, +e, +a, 0.95
+b, +e, -a, 0.05
+b, -e, +a, 0.94
+b, -e, -a, 0.06
-b, +e, +a, 0.29
-b, +e, -a, 0.71
-b, -e, +a, 0.001
-b, -e, -a, 0.999
J | A
+a, +j, 0.9
+a, -j, 0.1
-a, +j, 0.05
-a, -j, 0.95
M | A
+a, +m, 0.7
+a, -m, 0.3
-a, +m, 0.01
-a, -m, 0.99
Query: P( B=+b| J=+j)

Project details


Download files

Download the file for your platform. If you're not sure which to choose, learn more about installing packages.

Source Distribution

bayes_nets_sample-1.5.tar.gz (8.9 kB view details)

Uploaded Source

Built Distribution

bayes_nets_sample-1.5-py3-none-any.whl (9.9 kB view details)

Uploaded Python 3

File details

Details for the file bayes_nets_sample-1.5.tar.gz.

File metadata

  • Download URL: bayes_nets_sample-1.5.tar.gz
  • Upload date:
  • Size: 8.9 kB
  • Tags: Source
  • Uploaded using Trusted Publishing? No
  • Uploaded via: twine/4.0.2 CPython/3.8.13

File hashes

Hashes for bayes_nets_sample-1.5.tar.gz
Algorithm Hash digest
SHA256 be0c7f0a861a2095fde9b821d3974f2ea414a45aaa5732aebd3918135be02a9f
MD5 2d1f920aa02b11bbd35aac1a04a1211b
BLAKE2b-256 ecd24d51cf103e6d222b601154eaf925a3180b4b9290cb58b4263a7e7cc71296

See more details on using hashes here.

File details

Details for the file bayes_nets_sample-1.5-py3-none-any.whl.

File metadata

File hashes

Hashes for bayes_nets_sample-1.5-py3-none-any.whl
Algorithm Hash digest
SHA256 2bec3b52c2b6d9976cf7ccb4bf11aa483d3c3d2e9e99bca1bef5face8f9dbe27
MD5 c659f7fa45564b02525b9608c7e7ec05
BLAKE2b-256 5fa72564b73937ca54f1264f3791d86765fa8fb461f596847b9abb48b2501c94

See more details on using hashes here.

Supported by

AWS AWS Cloud computing and Security Sponsor Datadog Datadog Monitoring Fastly Fastly CDN Google Google Download Analytics Microsoft Microsoft PSF Sponsor Pingdom Pingdom Monitoring Sentry Sentry Error logging StatusPage StatusPage Status page