Error? Enter settings separately (I want to know the power of calculus) Suppose there is a person who has 3 plans every day, making progress one thousandth, one thousandth, one hundred thousandth every day until they iterate 200, 500, 1000, 2000, 3000, 5000, 9000 times, where do they draw the curve in the picture? graph, […]
Tag: iteration
Python iteration tool timing comparison
1 Python iteration tool timing comparison The python iteration tool automatically calls the next method of the iteration object to traverse the iteration object. Python’s for loop, list analysis, map method, generator expression, and generator method are all iteration tools. Python iterable objects include: strings, lists, tuples, dictionaries, sets, ranges, enumerates, files, etc. 1.1 Python […]
anonymous, built-in, iteration, exception
Article directory anonymous function Common built-in functions 1. map 2.zip 3.max and min 4.filter Iterate 1. Iterable object (iterable) 2. Iterator object 3. Principle of for loop Exception catching Anonymous function In Python, an anonymous function is often called a lambda function, which is a small, unnamed function that can be used immediately where it […]
Iteration vs vectorization, how to improve Pandas performance?
This article mainly introduces several iteration and vectorization techniques to explore how to improve the performance of Pandas. Search and follow “Python Learning and Research Basecamp” on WeChat, join the reader group, and share more exciting things In this article, we will explore several ways to improve the performance of your Pandas code through iteration […]
RuntimeError: Expected to have finished reduction in the prior iteration before starting a new one.
pytorch multi-GPU (single machine multi-card) training pit: RuntimeError: Expected to have finished reduction in the prior iteration before starting a new one. Problem Description Question exploration forward outputs multiple parameters but does not participate in loss calculation and will not cause an error. The key to the error is that some layers are defined in […]
[Data structure – tree] Binary tree traversal (preorder, inorder, postorder, level order) iteration + recursion
Article directory Binary tree definition How to traverse a binary tree Preorder traversal Recursive DFS Iteration (stack) inorder traversal Recursive DFS Iteration (stack) Postorder traversal Recursive DFS Iteration (stack) level-order traversal iterate(queue) Definition of binary tree Binary tree is a common tree-like data structure, which consists of a node called the root node (Root) and […]
GEE Training: The difference between qualityMosaic and max | iterate iteration (3)
① var median = collection.reduce(ee.Reducer.median()); ② var median = collection.median(); These two expressions are exactly the same, but they are written in different ways. The final result is an image. reducing: Statistics are performed pixel by pixel in all data in the collection and summarized into a single layer image. Note: The composite image generated […]
Complete three traversals of binary trees using recursion and iteration
Table of Contents Preorder traversal of a binary tree topic Preorder traversal topic link recursive code 1. Code that utilizes method return values 2. Code whose return value is void Non-recursive implementation of preorder traversal (using stack) 1. Code that utilizes method return values 2. Code whose return value is void Inorder traversal of a […]
11. Function recursion and iteration
Recursion and iteration 1. What is recursion? 2. Recursive constraints 3. Recursive example 3.1 Finding the factorial of n 3.2 Print each digit of an integer in sequence 4. Recursion and iteration 4.1 Find the nth Fibonacci number (recursion is not recommended) 4.2 Find the nth Fibonacci number (iteration recommended) 4.3 Summary 1. What is […]
C language recursion and iteration
Directory one recursion Recursion: Recursion is recursion, return is regression. function calls itself Recursive thinking: complex problems are transformed into sub-problems similar to the original problem but smaller in size until the sub-problems cannot be split. Recursive writing conditions: There are restrictions on recursion. When this condition is met, the recursion ends. This limit is […]