Generate python code based on based on the evaluation paper "Co-Writing Screenplays and Theatre Scripts with Language Models", using huggingface transformer library, any available large language model pretrained checkpoint, and python. The functions should be divided into 3 hierarchical layers of abstraction. 

The highest layer is user input, a single sentence describing the central dramatic conflict. 
The middle layer generates character descriptions, a plot outline (a sequence of high-level scene descriptions together with corresponding locations), and location descriptions. 
The bottom layer is generated character dialogue for the text of the script.
Here is a sample code that implements the three-layer hierarchy described in the evaluation paper:


import transformers
import torch

class ScriptGenerator:
    def __init__(self):
        self.model = transformers.pipeline("text-generation", model="xlm-roberta-base")

    def generate_script(self, central_conflict):
        # highest layer: user input
        characters, plot_outline, locations = self.middle_layer(central_conflict)
        script_text = self.bottom_layer(characters, plot_outline, locations)
        return script_text

    def middle_layer(self, central_conflict):
        # generate character descriptions
        characters = self.generate_characters()
        # generate plot outline and locations
        plot_outline, locations = self.generate_plot_outline(central_conflict)
        return characters, plot_outline, locations

    def bottom_layer(self, characters, plot_outline, locations):
        # generate character dialogue
        script_text = self.generate_dialogue(characters, plot_outline, locations)
        return script_text

    def generate_characters(self):
        prompt = "Generate a description of a character for a play or movie."
        character_description = self.model(prompt, max_length=1024, num_return_sequences=1)[0].generated_text
        return character_description

    def generate_plot_outline(self, central_conflict):
        prompt = f"Generate a plot outline for a play or movie with the central conflict: {central_conflict}"
        plot_outline = self.model(prompt, max_length=1024, num_return_sequences=1)[0].generated_text
        # extract locations from plot outline
        locations = self.extract_locations(plot_outline)
        return plot_outline, locations

    def extract_locations(self, plot_outline):
        # code to extract locations from plot outline
        locations = []
        # dummy code, replace with actual implementation
        locations.append("A quiet coffee shop")
        locations.append("A busy city street")
        return locations

    def generate_dialogue(self, characters, plot_outline, locations):
        prompt = f"Generate dialogue for a play or movie with the following characters: {characters} and plot outline: {plot_outline} and locations: {locations}"
        dialogue = self.model(prompt, max_length=1024, num_return_sequences=1)[0].generated_text
        return dialogue

if __name__ == "__main__":
    generator = ScriptGenerator()
    central_conflict = "Two estranged brothers must reunite to save their family business from financial ruin."
    script_text = generator.generate_script(central_conflict)
    print(script_text)


This code uses the Hugging Face Transformers library and a pre-trained language model checkpoint to generate script text. The functions are organized into three hierarchical layers, with the highest layer accepting a single sentence describing the central dramatic conflict, the middle layer generating character descriptions, a plot outline, and location descriptions, and the bottom layer generating character dialogue for the script.