用huggingface里的库操作GPT模型
实例化文本生成管道，生成文本：
from transformers import pipeline
model_name = 'openai-gpt'
generator = pipeline('text-generation', model=model_name)
generator("Hello! I am a neural network, and I want to say that", max_length=100, num_return_sequences=5)
结果；
[{'generated_text': "Hello! I am a neural network, and I want to say that i apologize for not coming to you yourself, for not helping you, and that i was too busy getting dressed and studying for a midterm. you know, the kind where the teachers are like that and they come in pairs with their boyfriends, but not with theirs. it's true, that i have had a girlfriend, and i'm only going on wednesdays and thursdays because i was too busy with college, but maybe"},
{'generated_text': 'Hello! I am a neural network, and I want to say that we have been blessed with a wonderful gift ; no one of us has died at all. and our spirits are strong, very strong. in one very lucky moment of luck for you, all has been given direction and destiny, and for us there are no more mysteries. the earth has been chosen for you, and that earth is now ours, and you must be forever in our hearts. " \n the words, as one,'},
{'generated_text': 'Hello! I am a neural network, and I want to say that if you would just turn and face the general, you would have a nice day. " \n " sure thing, " said one of the soldiers, and started to run. the rest of the soldiers followed, shouting. the general turned to general zulu, raising his arm. the general said something in his native language, and the general immediately started to run. zulu started to move toward the wall, with the'},
{'generated_text': 'Hello! I am a neural network, and I want to say that i am not a doctor but an anthropologist to you, a specialist, a specialist in the field of astrobiological biology, and that i am very much involved in this investigation. i am not sure, i am not certain, but i can confirm your conclusions and therefore i will go to the top. i have a colleague who has just returned from this expedition and his findings confirm that you are a specialist. that is, he'},
{'generated_text': "Hello! I am a neural network, and I want to say that everyone here is in agreement that no matter how many times i say to myself,'he was never a man of action on the battlefield,'or'he 'll never take a chance at killing any civilians,'or'he 'll never let his men go undefended against enemy forces of this caliber,'or'that's just what i need in a day like today. \n you see, there are only three groups that"}]
Prompt工程：
generator("Synonyms of a word cat:", max_length=20, num_return_sequences=5)
结果：
[{'generated_text': 'Synonyms of a word cat: the same cat i used to stare at, and you in'},
{'generated_text': 'Synonyms of a word cat: cat of the woods, cat of the hills, cat of'},
{'generated_text': 'Synonyms of a word cat: you! \n " it\'s a girl. " i said'},
{'generated_text': "Synonyms of a word cat: big cat. but how come, we didn't hear it"},
{'generated_text': 'Synonyms of a word cat: " mea - o - c " which makes them sound'}]
generator("I love when you say this -> Positive\nI have myself -> Negative\nThis is awful for you to say this ->", max_length=40, num_return_sequences=5)
结果：
[{'generated_text': 'I love when you say this -> Positive\nI have myself -> Negative\nThis is awful for you to say this -> positive this is so horrible - > positive that your brother is gay - >'},
{'generated_text': 'I love when you say this -> Positive\nI have myself -> Negative\nThis is awful for you to say this -> negative i will bring this on you -, < positive am i, i'},
{'generated_text': 'I love when you say this -> Positive\nI have myself -> Negative\nThis is awful for you to say this -> negative i have self - esteem i must take it - : \n - -'},
{'generated_text': 'I love when you say this -> Positive\nI have myself -> Negative\nThis is awful for you to say this -> negative this is - : \n if it were true that the devil would have'},
{'generated_text': "I love when you say this -> Positive\nI have myself -> Negative\nThis is awful for you to say this -> positive i have you - > positive it's a bad thing, > positive"}]
generator("Translate English to French: cat => chat, dog => chien, student => ", top_k=50, max_length=30, num_return_sequences=3)
结果：
[{'generated_text': 'Translate English to French: cat => chat, dog => chien, student => new and unusual. there were no more words to be'},
{'generated_text': 'Translate English to French: cat => chat, dog => chien, student => student \n his eyes were huge in his lean face as'},
{'generated_text': "Translate English to French: cat => chat, dog => chien, student => the teacher's words, their words, their words."}]
generator("People who liked the movie The Matrix also liked ", max_length=40, num_return_sequences=5)
结果：
[{'generated_text': 'People who liked the movie The Matrix also liked it, and there was the movie of the first man after us. \n i wanted to laugh at how stupid these stupid actors were. no, they were'},
{'generated_text': "People who liked the movie The Matrix also liked the movie, and the film was the result. and that's when the man in the story was brought into reality, after a few decades. \n a"},
{'generated_text': 'People who liked the movie The Matrix also liked the movie the matrix, because there was a very old movie movie called the matrix, where there was a great super hero, and the super hero came out'},
{'generated_text': "People who liked the movie The Matrix also liked the movie that didn't have a chance to pay cash, if they could afford it. most often they got a good deal and a lot of money,"},
{'generated_text': "People who liked the movie The Matrix also liked the movie, and i didn't seem to have the same problem. \n i 'd met the other half of my family. i spent most of my time"}]
文本采样策略：简单贪婪采样
prompt = "It was early evening when I can back from work. I usually work late, but this time it was an exception. When I entered a room, I saw"generator(prompt,max_length=100,num_return_sequences=5)
输出；
[{'generated_text': 'It was early evening when I can back from work. I usually work late, but this time it was an exception. When I entered a room, I saw my friend, a young man, sprawled across the bed in his bed. \n " hi, i\'m mike eptirard. " \n there was silence on the other side of the door. i listened for any trace of life but there was nothing. my heart began to pound, i was starting to sweat, i took out my wallet'},
{'generated_text': 'It was early evening when I can back from work. I usually work late, but this time it was an exception. When I entered a room, I saw my mother on the bed, hugging her legs to her chest and sobbing. i saw my dad and mother from the corner of my eye. \n elfin face was covered in tears as i entered the room. my dad and mother also wept ; just as they did every other time i came to work. but this time, they had different faces'},
{'generated_text': 'It was early evening when I can back from work. I usually work late, but this time it was an exception. When I entered a room, I saw the room had changed because it was dark. it still smelled like a hospital. a new light shined through from a vent in the ceiling. i found myself in a bathroom and a small room with a sink and a wall of glass. the bathroom billion years ago. not so different from all of the rest of the apartment. \n now...'},
{'generated_text': 'It was early evening when I can back from work. I usually work late, but this time it was an exception. When I entered a room, I saw a large woman with dark hair and pale skin. she was asleep, but i noticed a faint movement of her face. i could sense she was awake. i got up and walked over to her. \n " hello miss. i am inspector michael o\'dell ; we are investigating the case against you. i wanted to ask if you were the'},
{'generated_text': 'It was early evening when I can back from work. I usually work late, but this time it was an exception. When I entered a room, I saw i had an empty table and three empty chairs. that was all i needed. i had left a note on a table in the center of the room and had a pen in hand. " \n " i think what you were doing was something he was doing to her. " \n " yeah, " i nodded with a grin. " i'}]
束搜索：生成器探索多条候选路径 = 束；选总体得分最高的路径
参数有两个：num_beams（束宽，控制并行探索的路径数），no_repeat_ngram_size（禁止重复指定长度ngram，ngram=2避免重复 二元组）
prompt = "It was early evening when I can back from work. I usually work late, but this time it was an exception. When I entered a room, I saw"generator(prompt,max_length=100,num_return_sequences=5,num_beams=10,no_repeat_ngram_size=2)
输出：
[{'generated_text': 'It was early evening when I can back from work. I usually work late, but this time it was an exception. When I entered a room, I saw a man sitting in a chair with his head in his hands. he didn\'t look up as i approached. \n " excuse me, sir, " i said. " can i help you? " \n the man looked up at me. his eyes were red - rimmed and his face was pale, as if he hadn\'t slept in days'},
{'generated_text': 'It was early evening when I can back from work. I usually work late, but this time it was an exception. When I entered a room, I saw a man sitting at a desk in the middle of the room. he had his back to me, so i couldn\'t see what he was doing. " \n " what did he look like? " i asked as i sat down on the bed next to her. \n she took a deep breath and looked at me with tears in her eyes'},
{'generated_text': 'It was early evening when I can back from work. I usually work late, but this time it was an exception. When I entered a room, I saw a woman sitting on the bed, reading a book. she looked up at me and smiled. \n " hi, " she said. " can i help you? " \n i sat down next to her and looked around the room. the walls were white, and there was a large window in the middle of the wall that looked out on'},
{'generated_text': 'It was early evening when I can back from work. I usually work late, but this time it was an exception. When I entered a room, I saw a man sitting at a table in the middle of the room. he looked up as i walked in, and when he saw me, he got up and walked over to me. \n " can i help you? " he asked as he put his hand on the small of my back and led me to a chair at the other end of'},
{'generated_text': 'It was early evening when I can back from work. I usually work late, but this time it was an exception. When I entered a room, I saw a woman sitting on the edge of her bed, reading a book. she looked up at me and smiled. \n " hello, " she said. " can i help you? " \n i didn\'t know what to say, so i just sat down in the chair next to the bed and looked at her. her hair was dark brown'}]
随机采样：do_sample=True，调温度参数T
top_k参数：只从概率最高的k个词中采样；可减少低概率次生成（提升文本质量），top_k=50从Top50词里面选
top_p参数：只从累积概率=p的词中采样（核采样），候选词数量随分布动态变化，top_p=0.92 = 选不断选词直到累计概率>=0.92
prompt = "It was early evening when I can back from work. I usually work late, but this time it was an exception. When I entered a room, I saw"generator(prompt,max_length=100,do_sample=True,temperature=0.8)
输出：
[{'generated_text': 'It was early evening when I can back from work. I usually work late, but this time it was an exception. When I entered a room, I saw her. she was on the bed, but she looked very different. \n " honey, what\'s the matter? " i asked. \n she sat up. " i can\'t believe it\'s real. i\'ve been dreaming about you for the last two days. " \n " i can\'t believe it either. i guess that\'s how'}]
微调GPT模型：Azure的，要收费，看一下就行，自己本地部署更省钱