Add relu and test.

relu.test.ts

@@ -0,0 +1,35 @@
+import { relu } from './relu'; // Import your relu function from your implementation file
+
+describe('relu', () => {
+    it('should apply ReLU activation correctly for positive input', () => {
+        // Define input and expected output for positive input
+        const input = 3; // Positive input
+        const expectedOutput = 3; // Expected output (same as input)
+
+        // Convert input to a Field (assuming you have a way to represent numbers as Fields)
+        const inputField = ...; // Convert input to a Field
+
+        // Call the relu function
+        const result = relu(inputField);
+
+        // Assert that the result matches the expected output
+        expect(result.toNumber()).toEqual(expectedOutput);
+    });
+
+    it('should apply ReLU activation correctly for negative input', () => {
+        // Define input and expected output for negative input
+        const input = -2; // Negative input
+        const expectedOutput = 0; // Expected output (ReLU turns negative input to zero)
+
+        // Convert input to a Field (assuming you have a way to represent numbers as Fields)
+        const inputField = ...; // Convert input to a Field
+
+        // Call the relu function
+        const result = relu(inputField);
+
+        // Assert that the result matches the expected output
+        expect(result.toNumber()).toEqual(expectedOutput);
+    });
+
+    // Add more test cases as needed
+});

relu.ts

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+function relu(input) {
+    // If input is greater than or equal to zero, return input; otherwise, return zero.
+    return input.greaterThanOrEqual(0).ifElse(input, new Field(0));
+}