tf.image.resize(image, size=(256, 256), preserve_aspect_ratio=False)

This is a TensorFlow function that resizes an image to a specified size. The function takes two arguments:

- `image`: The input image to be resized. It should be a 3D tensor of shape `(height, width, channels)` or a 4D tensor of shape `(batch_size, height, width, channels)`.
- `size`: A tuple of two integers specifying the target size of the output image. The first integer corresponds to the target height and the second integer corresponds to the target width.

If `preserve_aspect_ratio` is set to `True`, the function will resize the image to the specified size while preserving its aspect ratio. This means that the aspect ratio of the output image may not match the aspect ratio of the input image, and some parts of the input image may be cropped out.

If `preserve_aspect_ratio` is set to `False` (the default), the function will resize the image to the specified size without preserving its aspect ratio. This means that the output image will have the exact target size, but its aspect ratio may be different from the input image.