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 /// <summary>
/// Gets a shared semaphore to avoid loading multiple Win2D resources at the same time
/// </summary>
private static readonly  SemaphoreSlim Win2DSemaphore = new SemaphoreSlim(1);

/// <summary>
/// Creates an effect brush that's similar to the official Acrylic brush in the Fall Creator's Update.
/// The pipeline uses the following effects: HostBackdropBrush > <see cref="LuminanceToAlphaEffect"/> >
/// <see cref="OpacityEffect"/> > <see cref="BlendEffect"/> > <see cref="ArithmeticCompositeEffect"/> >
/// <see cref="ColorSourceEffect"/> > <see cref="BorderEffect"/> with customizable blend factors for each couple of layers

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import tensorflow as tf

'''
This snippet reproduces an error when trying to load multiple shared instances
of a Keras model in TensorFlow, when accessing the same scope multiple times.
Creating multiple instances repeatedly in a single step works.
'''

def load_vgg19_multiple(tensors):
    '''Creates n shared instances of VGG19, in a single run.'''

Sergio0694

The Generic Operator pattern

The Generic Operator pattern (GO pattern, for short) works around two limitations in C#:

• The lack of static interface methods
• The lack of virtual static methods (eg. static methods that can be inherited and overridden)

The first one is pretty easy to demonstrate:

public interface IDoThings

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using System;
using System.IO;
using System.Numerics;
using System.Reflection;
using System.Runtime.CompilerServices;
using System.Threading.Tasks;
using BenchmarkDotNet.Attributes;
using BenchmarkDotNet.Running;
using ComputeSharp;
using SixLabors.ImageSharp;

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public static void Main()
{
    int[] array = new int[100];
    int value = 1;

    Action<int> action = i => array[i] = value;
}

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[CompilerGenerated]
private sealed class <>c__DisplayClass0_0
{
    public int[] array;

    public int value;

    internal void <Main>b__0(int i)
    {
        array[i] = value;

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public static void Main()
{
    int[] array = new int[100];
    {
        int value = 1;

        Action<int> action = i => array[i] = value;
    }
}

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[CompilerGenerated]
private sealed class <>c__DisplayClass0_0
{
    public int[] array;
}

[CompilerGenerated]
private sealed class <>c__DisplayClass0_1
{
    public int value;

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public static void Main()
{
    object instance = "Hello world";

    Type type = instance.GetType(); // System.String
    PropertyInfo property = type.GetProperty("Length");
    
    object value = property.GetValue(instance);

    Console.WriteLine(value); // Prints 11

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public static void Main()
{
    object instance = new Vector3(1, 2, 3);

    foreach (FieldInfo property in instance.GetType().GetFields())
    {
        Console.WriteLine($"{property.Name}: {property.GetValue(instance)}");
        // X: 1
        // Y: 2
        // Z: 3