Plot of predictions with test data in Colab notebook doesn't make much sense

In the Colab notebook, after the training we plot some graphs.
The last one, which is "Plot the predictions along with to the test data", is literally taken from a standard TensorFlow Lite example notebook (see https://colab.research.google.com/github/tensorflow/tensorflow/blob/master/tensorflow/lite/experimental/micro/examples/hello_world/create_sine_model.ipynb#scrollTo=L_vE-ZDkHVxe )
but does not make much sense in this context.

Besides that, the code for that plot currently (ab)uses a deprecated matplotlib behaviour
```
/usr/local/lib/python3.6/dist-packages/matplotlib/axes/_base.py:380: MatplotlibDeprecationWarning:
cycling among columns of inputs with non-matching shapes is deprecated.
```
which also suggests that the current plot is a bit nonsensical.

Abre el cuaderno de Colab e inspecciona la sección final "Plot the predictions along with to the test data", comparándola con el ejemplo de TensorFlow Lite enlazado. Ejecuta el cuaderno hasta completar el entrenamiento y revisa el gráfico para que represente los datos de prueba y las predicciones de forma significativa, sin la advertencia de obsolescencia de Matplotlib indicada.

Escrito por el modelo de indexación a partir del texto del issue.