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I don't think it's a derivative work just because one of the inputs is copyrighted. I think it's more descriptive than derivative. Content producers don't generally own copyright in critics' descriptions of their movies or of plot summaries, even though their copyrighted material is a necessary input to the description's creation.

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Also, good luck trying to prove that your film was used to train this network.

You could be compelled to produce your training set during the discovery phase of a lawsuit.

Only if there was any reasonable basis to believe that infringement had taken place. Most countries have some sort of pre-trial hearing before a civil suit to determine if there's merit to the accusation. You're generally not allowed to go on fishing expeditions without a reasonable basis for your claim(s).

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