hi,

I wish you all happy holidays and Merry Xmas!

the quantum neural network tutorial uses the state method as an exact measurement. i tried to make a very simple version of it i.e. single layer and no inputs and another version with a single input. then i tried to compute the gradients with respect to the samples. the measurement was homodyne.

the output from `tape.gradient`

is `None`

to reproduce the error:

the cost function can be somthing like this:

tf.abs(tf.squeeze(results.samples) - 1)

the number of modes are 1

SF version is 0.16.0