# Copyright (c) 2024, NVIDIA CORPORATION. All rights reserved.
class InferenceParams:
    """Inference parameters that are passed to the main model in order
    to efficienly calculate and store the context during inference."""

    def __init__(self, max_batch_size, max_sequence_length):
        self.max_sequence_length = max_sequence_length
        self.max_batch_size = max_batch_size
        self.sequence_len_offset = 0
        self.batch_size_offset = 0
        self.key_value_memory_dict = {}

    def swap_key_value_dict(self, batch_idx):
        "swap between batches"
        if len(self.key_value_memory_dict) == 0:
            raise ValueError("should not swap when dict in empty")

        for layer_number in self.key_value_memory_dict.keys():
            inference_key_memory, inference_value_memory = self.key_value_memory_dict[layer_number]
            assert (
                len(batch_idx) == inference_key_memory.shape[1]
            )  # make sure batch size is the same
            new_inference_key_memory = inference_key_memory[:, batch_idx]
            new_inference_value_memory = inference_value_memory[:, batch_idx]
            self.key_value_memory_dict[layer_number] = (
                new_inference_key_memory,
                new_inference_value_memory,
            )

    def __str__(self):
        return f"InferenceParams(max_seq_len = {self.max_sequence_length}, max_batch_size = {self.max_batch_size}, sequence_len_offset = {self.sequence_len_offset}, batch_size_offset = {self.batch_size_offset}, key_value_memory_dict = {self.key_value_memory_dict.keys()})"
