jagged accuracy curve in tensorflow

最新推荐文章于 2025-06-07 15:38:54 发布

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What is f-string in python

step = 5
test_accuracy = 0.77777
print(f'step {step:05d}, test accuracy {test_accuracy}\n') # f-strings
# It's more simple than
print('step {:05d}, test accuracy {}\n'.format(step, test_accuracy ))

reference

The new f-strings in Python 3.6 | Seasoned & Agile
https://cito.github.io/blog/f-strings/

What’s New In Python 3.6 — Python 3.6.5 documentation
https://docs.python.org/3/whatsnew/3.6.html

PEP 498 – Literal String Interpolation | Python.org
https://www.python.org/dev/peps/pep-0498/

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Jagged array

最新发布

07-24

### Understanding Jagged Arrays A jagged array is an array whose elements are arrays. It is also referred to as an array of arrays and can have one or more dimensions. Unlike a rectangular array, which has a fixed structure like a matrix, a jagged array allows each row to contain a different number of elements. This flexibility makes jagged arrays useful in situations where the data structure is irregular or sparse [^1]. ### Usage in C# In C#, jagged arrays are declared using a specific syntax where each dimension is represented by a separate set of square brackets. For example, a two-dimensional jagged array can be declared as `int[][]`. Each element in the primary array is itself an array, allowing for varying lengths. Here's an example of how to declare and initialize a jagged array in C#: ```csharp int[][] jaggedArray = new int[3][]; jaggedArray[0] = new int[2] { 1, 2 }; jaggedArray[1] = new int[3] { 3, 4, 5 }; jaggedArray[2] = new int[4] { 6, 7, 8, 9 }; ``` In this example, `jaggedArray` contains three elements, each of which is an array of integers with different lengths. The first array has two elements, the second has three, and the third has four [^2]. ### Usage in Java Java also supports jagged arrays, and they are often used to represent two-dimensional data structures where the rows can have different lengths. In Java, a jagged array can be declared and initialized as follows: ```java int[][] jaggedArray = new int[3][]; jaggedArray[0] = new int[] { 1, 2 }; jaggedArray[1] = new int[] { 3, 4, 5 }; jaggedArray[2] = new int[] { 6, 7, 8, 9 }; ``` Similar to C#, each element in the primary array is another array, which can vary in length according to the requirements of the application [^2]. ### Working with Jagged Arrays When working with jagged arrays, it is important to manage the memory allocation for each sub-array. In both C# and Java, objects, including arrays, are created on the heap using the `new` keyword. This means that each sub-array in a jagged array must be explicitly initialized with its own `new` statement. Memory management in these languages is handled by garbage collectors, which automatically reclaim memory that is no longer in use [^2]. Jagged arrays can be particularly useful when dealing with datasets that do not conform to a strict rectangular structure. They offer a more efficient way to store and access data compared to using a single large rectangular array with many unused elements. ### Conclusion Jagged arrays provide a flexible way to store arrays of arrays with varying lengths in programming languages like C# and Java. They are especially useful for representing irregular or sparse data structures efficiently. Proper initialization and management of each sub-array are essential to utilize jagged arrays effectively in applications.