在第2章 神经网络原理 中 2-3-3 偏微分的内容中有个使用梯度下降法找最小值的代码,在机器学习的很多问题中,都可以通过使用梯度下降算法最小化损失函数来解决,这个案例可以帮助大家更加深入理解梯度下降的原理,分享给大家~
``` # Python script for unit testing with the unittest module import unittest def add(a, b): return a + b class TestAddFunction(unittest.TestCase): def test_add_positive_numbers(self): self.assertEqual(add(2, 3), 5) def test_add_negative_numbers(self): self.assertEqual(add(-2, ...
[外链图片转存失败,源站可能有防盗链机制,建议将图片保存下来直接上传(img-QsRlhoyY-1681961425704)(https://gitcode.net/apachecn/apachecn-cv-zh/-/raw/master/docs/handson-imgproc-py/img/ad15e7a2-2613-449f-a932-93a20c55063d.png)] 使用skimage.filters.rank中的maximum()和minimum()功能,实现灰度...
Find the minimum element. You may assume no duplicate exists in the array. 这是LeetCode 上的一道算法题,题意是一个已经排序的数组,截断后重新拼接,找出数组中最小的数字。 这道题目用 Python 来实现的话太简单了。代码如下: classSolution:#@param num, a list of integer#@return an integerdeffindMin...
Help on function array in module pandas.core.construction: array(data: 'Sequence[object] | AnyArrayLike', dtype: 'Dtype | None' = None, copy: 'bool' = True) -> 'ExtensionArray' Create an array. Parameters --- data : Sequence of objectsThe scalars inside `data` should be instances of...
""" Compute the Harris corner detector response function for each pixel in a graylevel image. """ # derivatives imx = zeros(im.shape) # x方向上的高斯导数 filters.gaussian_filter(im, (sigma,sigma), (0,1), imx) imy = zeros(im.shape) ...
class Solution: def minimumDiameterAfterMerge(self, edges1: List[List[int]], edges2: List[List[int]]) -> int: g1 = {} for a, b in edges1: g1.setdefault(a, []).append(b) g1.setdefault(b, []).append(a) g2 = {} for a, b in edges2: g2.setdefault(a, []).append(b...
set(CMAKE_BUILD_TYPE "Debug" CACHE STRING "Choose the type of build." FORCE) endif() add_compile_options(-Wall -Werror -O3 -Wno-unused-function) set(CMAKE_C_STANDARD 99) set(CMAKE_C_STANDARD_REQUIRED True) find_package(OpenMP) ...
function-declaration -fvisibility=hidden" CONFIGURE_CPPFLAGS = "" CONFIGURE_LDFLAGS = "" CONFIGURE_LDFLAGS_NODIST = "" CONFIG_ARGS = "'--enable-optimizations' '--with-ensurepip=install' '--prefix=/share/apps/python/3.9.6' '--disable-shared'" CONFINCLUDEDIR = "/share/apps/python/3.9.6/...
Python uses the name “function” to describe a reusable chunk of code. Other programming languages use names such as “procedure,”“subroutine,” and “method.” When a function is part of a Python class, it‘s known as a “method.”. You’ll learn all about Python’s classes and me...