请给我列出常用的自然语言处理模型及其对应的用途，按照json格式统一输出，格式为：
    "model_name": "模型名称",
    "application": "用途"
}
user
{
    "BERT": {
        "model_name": "BERT",
        "application": "文本分类、命名实体识别、情感分析、问答系统等"
    },
    "GPT": {
        "model_name": "GPT",
        "application": "文本生成、语言翻译、对话系统、文本摘要等"
    },
    "RNN": {
        "model_name": "RNN",
        "application": "序列数据处理、时间序列预测、文本生成等"
    },
    "LSTM": {
        "model_name": "LSTM",
        "application": "长文本处理、语音识别、机器翻译等"
    },
    "Transformer": {
        "model_name": "Transformer",
        "application": "机器翻译、文本生成、文本分类等"
    }
}
assistant