import unittest
import importlib
import torch


def _dynamic(test, cond, ok, fail):
    if cond:
        test._testMethodName = ok
        test.assertTrue(True)
    else:
        test._testMethodName = fail
        test.fail(fail)


class TestUserCode(unittest.TestCase):

    # -------- manual seed --------
    def test_seed_set(self):
        with open("user_code.py") as f:
            src = f.read()

        cond = "torch.manual_seed" in src

        _dynamic(
            self,
            cond,
            "The manual seed is set correctly.",
            "You must set a manual seed using `torch.manual_seed()` before creating any tensors."
        )

    # -------- weights_layer1 --------
    def test_weights1_exists(self):
        import user_code
        cond = hasattr(user_code, "weights_layer1")
        _dynamic(
            self,
            cond,
            "`weights_layer1` is successfully defined.",
            "`weights_layer1` is missing. Assign your 3x4 uniform-random tensor to this variable."
        )

    def test_weights1_valid(self):
        import user_code
        try:
            t = user_code.weights_layer1
            cond = (
                isinstance(t, torch.Tensor)
                and t.shape == (3, 4)
                and torch.all(t >= 0)
                and torch.all(t < 1)
            )
        except:
            cond = False

        _dynamic(
            self,
            cond,
            "`weights_layer1` is a valid 3x4 tensor with values uniformly sampled from [0, 1).",
            "`weights_layer1` must be created with `torch.rand(3, 4)` so that all values lie between 0 and 1."
        )

    # -------- biases_layer1 --------
    def test_biases1_exists(self):
        import user_code
        cond = hasattr(user_code, "biases_layer1")
        _dynamic(
            self,
            cond,
            "`biases_layer1` is successfully defined.",
            "`biases_layer1` is missing. You must assign a 1x4 zero tensor to this variable."
        )

    def test_biases1_valid(self):
        import user_code
        try:
            t = user_code.biases_layer1
            cond = (
                isinstance(t, torch.Tensor)
                and t.shape == (1, 4)
                and torch.all(t == 0)
            )
        except:
            cond = False

        _dynamic(
            self,
            cond,
            "`biases_layer1` is correctly created as a 1x4 tensor of zeros.",
            "`biases_layer1` must be a 1x4 zero tensor created using `torch.zeros(1, 4)`."
        )

    # -------- weights_layer2 --------
    def test_weights2_exists(self):
        import user_code
        cond = hasattr(user_code, "weights_layer2")
        _dynamic(
            self,
            cond,
            "`weights_layer2` is successfully defined.",
            "`weights_layer2` is missing. Assign a 4x2 integer tensor created with `torch.randint()`."
        )

    def test_weights2_valid(self):
        import user_code
        try:
            t = user_code.weights_layer2
            cond = (
                isinstance(t, torch.Tensor)
                and t.shape == (4, 2)
                and torch.all(t >= -5)
                and torch.all(t <= 5)
                and torch.equal(t, t.int())
            )
        except:
            cond = False

        _dynamic(
            self,
            cond,
            "`weights_layer2` is a valid 4x2 integer tensor with values in the range [-5, 5].",
            "`weights_layer2` must be created using `torch.randint(-5, 5, (4, 2))` to generate integer weights in the specified range."
        )

    # -------- printing output --------
    def test_printed_output(self):
        import user_code

        import io, sys
        buf = io.StringIO()
        sys.stdout = buf

        importlib.reload(user_code)
        sys.stdout = sys.__stdout__

        cond = len(buf.getvalue().strip()) > 0

        _dynamic(
            self,
            cond,
            "All tensors are printed as required.",
            "No output detected. Ensure that you print all three tensors exactly as instructed."
        )


if __name__ == "__main__":
    unittest.main()


test_code.py

Aprenda los conceptos fundamentales y avanzados necesarios para trabajar con PyTorch de manera eficiente. Adquiera una comprensión sólida de los tensores, incluyendo su creación, operaciones y cambio de forma. Explore los aspectos esenciales de los gradientes, la retropropagación y la regresión lineal antes de avanzar al manejo de conjuntos de datos. Domine las habilidades necesarias para construir, entrenar y evaluar redes neuronales.

Explora los fundamentos de PyTorch, centrándote en los tensores, la estructura de datos principal utilizada para los cálculos. Aprenderás sobre la creación de tensores, la inicialización aleatoria, las operaciones matemáticas y la manipulación de formas.

Explora conceptos clave para el entrenamiento de modelos en PyTorch, incluyendo el cálculo de gradientes y la realización de retropropagación en múltiples pasos. Domina la regresión lineal como modelo fundamental de aprendizaje automático e introduce el manejo eficiente de conjuntos de datos.

Descubra cómo construir, entrenar y evaluar redes neuronales utilizando PyTorch. Aprenderá a definir una red neuronal feedforward simple, optimizar sus parámetros mediante el entrenamiento y evaluar su rendimiento.

Desafío: Inicialización de Pesos y Sesgos del Modelo

Solución

Desafío: Inicialización de Pesos y Sesgos del Modelo

Solución