Giter VIP home page Giter VIP logo

Comments (2)

gravelcycles avatar gravelcycles commented on June 18, 2024

This actually seems pretty hard because it looks like scipy.special implements gamma using Fortran or C code. However, there is a math.gamma(x: float) function. It throws an error when you get float('inf'), but I wrote a quick wrapper as a workaround. It runs really quickly on values and is correct within 1E-12. However, I need to test to see how it would work on vectorized implementations.

Here is the function + test code:

import math
import scipy.special
from numpy import arange
import time

def gamma(x):
    try:
        return math.gamma(x)
    except ValueError:
        return float('inf')

def test_correctness():
    for i in arange(-10, 10, .01):
        if gamma(i) != scipy.special.gamma(i):
            print(i, gamma(i)- scipy.special.gamma(i))

def test_speed():
    start = time.time()
    for i in arange(-10, 10, .01):
        gamma(i)
    print("Our gamma time: ", time.time() - start)

    start = time.time()
    for i in arange(-10, 10, .01):
        scipy.special.gamma(i)
    print("scipy gamma time: ", time.time() - start)

test_correctness()
test_speed()

from mintpy.

yunjunz avatar yunjunz commented on June 18, 2024

@2gotgrossman Your solution looks good to me. The input of gamma() is usually small in our cases: < 2000, so the difference between math.gamma() and scipy.special.gamma() is definitely negligible for us.

from mintpy.

Related Issues (20)

Recommend Projects

  • React photo React

    A declarative, efficient, and flexible JavaScript library for building user interfaces.

  • Vue.js photo Vue.js

    🖖 Vue.js is a progressive, incrementally-adoptable JavaScript framework for building UI on the web.

  • Typescript photo Typescript

    TypeScript is a superset of JavaScript that compiles to clean JavaScript output.

  • TensorFlow photo TensorFlow

    An Open Source Machine Learning Framework for Everyone

  • Django photo Django

    The Web framework for perfectionists with deadlines.

  • D3 photo D3

    Bring data to life with SVG, Canvas and HTML. 📊📈🎉

Recommend Topics

  • javascript

    JavaScript (JS) is a lightweight interpreted programming language with first-class functions.

  • web

    Some thing interesting about web. New door for the world.

  • server

    A server is a program made to process requests and deliver data to clients.

  • Machine learning

    Machine learning is a way of modeling and interpreting data that allows a piece of software to respond intelligently.

  • Game

    Some thing interesting about game, make everyone happy.

Recommend Org

  • Facebook photo Facebook

    We are working to build community through open source technology. NB: members must have two-factor auth.

  • Microsoft photo Microsoft

    Open source projects and samples from Microsoft.

  • Google photo Google

    Google ❤️ Open Source for everyone.

  • D3 photo D3

    Data-Driven Documents codes.