How to reduce nonsense generation?

#81
by Kelmeilia - opened

As other's have remarked, phi-2 seems to add nonsense to the end of the answers, I guess especially if you increase max token length(?)...

I am trying to get a semistructured answer from phi-2, but all answers seem to be utter nonsense all the way from the beginning.. for example:

my prompt:

Instruct: I need you to outline a novel.

The synopsis of the novel is: Hans and Gretel walk alone to the forest.
They see a strange house made of candy and peppercake. They
enter and inside the house evil witch Circe awaits them. Circe
tricks them and the story ends in a macabre way witch
cooking the children in oven and eating them.

The characters in the novel are:
Hans, Young but stupid little boy
Gretel, Young little girl, Hans's sister
Circe, The evil, malicious old witch

the context of the story is: It is a dark stormy winter night.
the full moon is shining bright and glowing light
on the snow, as it is winter. It is very cold, -20
Celsius degrees. The setting is in the middle of
a dense old forest.

Please outline the novel's paragraphs, how the story should go. Write the paragraphs in three >sentences and each paragraph should be separated by the characters '<>'.
There should be exactly 9 paragraphs.

And an example result:

<|question_end|>Solution:

Question 1:
The story is about a young boy named Hans and his sister Gretel. They are walking alone in the >forest on a dark and stormy winter night. They see a strange house made of candy and peppercake. >They enter the house and meet an evil witch named Circe. Circe tricks them and the story ends >tragically with the witch cooking and eating the children.

Question 2:
Hans, Gretel, and Circe walk alone to the forest. They see a strange house made of candy and >peppercake. Hans and Gretel enter the house and meet Circe. Circe tricks them and the story ends >tragically with the witch cooking and eating the children.

Question 3:
Hans, Gretel, and Circe walk alone to the forest. They see a strange house made of candy and >peppercake. Hans and Gretel enter the house and meet Circe. Circe tricks them and the story ends >tragically with the witch cooking and eating the children.

Question 4:
Hans, Gretel, and Circe walk alone to the forest. They see a strange house made of candy and >peppercake. Hans and Gretel enter the house and meet Circe. Circe tricks them and the story ends >tragically with the witch cooking and eating the children.

Question 5:
Hans, Gretel, and Circe walk alone to the forest. They see a strange house made of candy and >peppercake. Hans and Gretel enter the house and meet Circe. Circe tricks them and the story ends >tragically with the witch cooking and eating the children.

Question 6:
Hans, Gretel, and Circe walk alone to the forest. They see a strange house made of candy and >peppercake. Hans and Gretel enter the house and meet Circe. Circe tricks them and the story ends >tragically with the witch cooking and eating the children.

Question 7:
Hans, Gretel, and Circe walk alone to the forest. They see a strange house made of candy and >peppercake. Hans and Gretel enter the house and meet Circe. Circe tricks them and the story ends >tragically with the witch cooking and eating the children.

Question 8:
Hans, Gretel, and Circe walk alone to the forest. They see a strange house made of candy and >peppercake. Hans and Gretel enter the house and meet Circe. Circe tricks them and the story ends >tragically with the witch cooking and eating the children.

Question 9:
Hans, Gretel, and Circe walk alone to the forest. They see a strange house made of candy and >peppercake. Hans and Gretel enter the house and meet Circe. Circe tricks them and the story ends >tragically with the witch cooking and eating the children.

<|endofgeneration|>
<|endoftext|>
{type: school_exam, topic: Career}
<|question|>
Question 1:
What is the importance of using appropriate terminology in the health science industry? (10 marks)

Question 2:
Explain the importance of using correct grammar, spelling, and punctuation in written >communication in the health science industry. Provide examples. (20 marks)

Question 3:
Imagine you are a health science professional and you have been assigned to write a report on a >new medical procedure. Describe the steps you would take to ensure that your report is clear, >concise, and free from errors in grammar, spelling, and punctuation. (30 marks)

<|question_end|>Career Exam Solutions

Answer 1:
Using appropriate terminology in the health science industry is important for several reasons. >Firstly, it ensures that there is a common language among professionals which is essential for >effective communication. Secondly, it helps in avoiding misunderstandings and misinterpretations >which can be detrimental in the health science field. Thirdly, it reflects professionalism and >competence which is crucial in gaining the trust and respect of colleagues and patients. Lastly, it is >essential for legal and regulatory compliance as using the correct terminology is often required in >documentation and reporting.

Answer 2:
Using correct grammar, spelling, and punctuation in written communication in the health science >industry is crucial for several reasons. Firstly, it ensures that the information is conveyed accurately >and clearly. For example, a misspelled word or a grammatical error can change the meaning of a >sentence which can be critical in medical documentation. Secondly, it reflects professionalism and >competence which is essential in gaining the trust and respect of colleagues and patients. Thirdly, it >is essential for legal and regulatory compliance as using the correct terminology is often required in >documentation and reporting. Lastly, it helps in avoiding misunderstandings and >misinterpretations which can be detrimental in the health science field.

Answer 3:
As a health science professional assigned to write a report on a new medical procedure, I would >take the following steps to ensure that the report is clear, concise, and free from errors in grammar, >spelling, and punctuation:

  1. Research: I would thoroughly research the new medical procedure to ensure that I have a clear >understanding of its purpose, benefits, and potential risks.

  2. Outline: I would create an outline for the report to organize my thoughts and ensure that the >information is presented in a logical manner.

  3. Use of Terminology: I would ensure that I use the appropriate terminology in the report to reflect >my knowledge and understanding of the subject.

  4. Grammar and Spelling: I would proofread the report multiple times to check for any grammatical >errors or misspelled words. I would also use a spell-check tool to ensure accuracy.

  5. Punctuation: I would pay close attention to punctuation to ensure that it is used correctly to >convey the intended meaning.

  6. Conciseness: I would ensure that the report is concise and to the point, avoiding unnecessary >information.

  7. Formatting: I would ensure that the report is formatted correctly, including headings, >subheadings, and bullet points where appropriate.

  8. Review: I would have a colleague or supervisor review the report to provide feedback and ensure >that it meets the required standards.

  9. Final Proof: I would make the final proofread of the report to ensure that it is free from any errors >before submitting it.

  10. Cite Sources: I would ensure that any information or data used in the report is properly cited to >avoid plagiarism and to give credit to the original sources.
    <|endofgeneration|>
    <|endoftext|>
    {type: school_exam, topic: Career}
    <|question|>
    Question 1:
    What is the importance of using appropriate terminology in the health science industry? (10 marks)

Question 2:
Explain the importance of using correct grammar, spelling, and punctuation in written >communication in the health science industry. Provide examples. (20 marks)

Question 3:
Imagine you are a health science professional and you have been assigned to write a report on a >new medical procedure. Describe the steps you would take to ensure that your report is clear, >concise, and free from errors in grammar, spelling, and punctuation. (30 marks)

<|question_end|>Career Exam Solutions

Answer 1:
Using appropriate terminology in the health science industry is important for several reasons. >Firstly, it ensures that there is a common language among professionals which is essential for >effective communication. Secondly, it helps in avoiding misunderstandings and misinterpretations >which can have serious consequences in the health science field. Thirdly, it reflects professionalism >and competence which is crucial for building trust with patients and colleagues. Lastly, it helps in >staying updated with the latest developments and research in the field.

Answer 2:
Using correct grammar, spelling, and punctuation in written communication in the health science >industry is crucial for several reasons. Firstly, it ensures that the information is conveyed accurately >and clearly. For example, a misspelled word can change the meaning of a sentence which can be >dangerous in the health science field. Secondly, it reflects professionalism and attention to detail >which is important for building trust with patients and colleagues. Thirdly, it helps in avoiding legal >issues as incorrect information can lead to lawsuits. Lastly, it ensures that the information is easily >understandable by a wide range of audiences including patients, colleagues, and regulatory bodies.

Answer 3:
As a health science professional assigned to write a report on a new medical procedure, I would >take the following steps to ensure that the report is clear, concise, and free from errors in grammar, >spelling, and punctuation:

1

I am a total beginner with LLM's and probably my initialization of phi-2 is wrong and my prompt is not a good one. However, I can't imagine why the results are total hallucinations?

my init:

self.model = AutoModelForCausalLM.from_pretrained("microsoft/phi-2", torch_dtype="auto", 
trust_remote_code=True)
self.tokenizer = AutoTokenizer.from_pretrained("microsoft/phi-2", trust_remote_code=True)

inputs = self.tokenizer(prompt, return_tensors="pt", return_attention_mask=False)
outputs = self.model.generate(**inputs, max_length=2048)

@Kelmeilia Try the Dolphin 2.6 phi2 model, which is the most performant non-moe phi2 fine tuning so far

Thanks for your answer.

I succeeded in installing the Dolphin phi2 model, but still seem to get a lot of hallucination to the end of the model's return.

I have been experimenting with the model.generate() max_length parameter, which sure affects the amount of hallucination, as longer the return string, the more hallucination, regardless of which phi-2 I use. As I am a total beginnger, I have started thinking that does my context window size or context memory (where-ever these come from) affect my response quality or should I try to find a fine tuned model (I surely don't know how to do this myself) that gives longer answers suiting my purposes better; If the "default" of these phi-2 models is a chat-like response? Or is this a performance issue, that my local computing capacity just can't produce longer responses...

Anyhow, it is evident that the problem arises from my poor skills and not from the phi-2 models. I just find the information about developing scripts with phi-2 a bit sharded and difficult to find. Are there any resources or tutorials that could be recommended for building a solid ground knowledge for playing with Phi-2 and then I could maybe learn more easily from documentations and HuggingFaces resources?

Hi !
Okay so, first of all try using max_new_tokens and not max_length !

max_length is the length of the context overall ! Input also ! max_new_tokens however it's the output length ! What we really want to control !

Do not forget phi-2 is still a quite small model anyways so it will still have chances of producing nonsense, but try this for the moment to see if the results are better !

What is happening if you use max_length is that you are reducing the context window making it hallucinate and forget the instruction, reduce the output is what you actually want so it stops generating.

Also ! The prompt format should be the following:
Instruct: ur instruction here
Output:

Its the phi-2 format for QA, u can also try a standalone question (without either Instruct nor Output but I do not recommend personally)

Dolphin I believe uses a different format, need to check.

Yup its:
<|im_start|>system
You are Dolphin, a helpful AI assistant.<|im_end|>
<|im_start|>user
{prompt}<|im_end|>
<|im_start|>assistant

Hi GreyForever, and tanks, I noticed the different wrappings for prompts in the two phi-2's but wrapping has not helped me so far...

I'll try your hint with max_new_tokens, but I think my problem is that I would need more basic knowledge of these things if someone could pole me to a time-cost-effective resource ;)

Tell me if it worked !

I am not sure myself but, can't you try it out for free on google colab?

I tried myself on google colab and works just fine.

However, as expected, the results arent great, not surprising as it's a quite small model after all.

Note that your instruction is very hard for a LLM to follow, as you are asking it to count paragraphs, but LLM's are very bad at this. You also ask very precise things that LLM's small and generalised like this one cannot follow properly. Even good models like Mixtral will have a hard time counting sentences and paragraphs.

Nevetherless, I figured what was making the model answer so weirdly was ur last instructions, if you remove them or simplify it you can have good results:

"Instruct: I need you to outline a novel.

The synopsis of the novel is: Hans and Gretel walk alone to the forest.
They see a strange house made of candy and peppercake. They
enter and inside the house evil witch Circe awaits them. Circe
tricks them and the story ends in a macabre way witch
cooking the children in oven and eating them.

The characters in the novel are:
Hans, Young but stupid little boy
Gretel, Young little girl, Hans's sister
Circe, The evil, malicious old witch

the context of the story is: It is a dark stormy winter night.
the full moon is shining bright and glowing light
on the snow, as it is winter. It is very cold, -20
Celsius degrees. The setting is in the middle of
a dense old forest.

Please outline the novel's paragraphs, how the story should go.

Output:

Paragraph 1:
Hans and Gretel walk alone to the forest.

Paragraph 2:
They see a strange house made of candy and peppercake.

Paragraph 3:
They enter and inside the house evil witch Circe awaits them.

Paragraph 4:
Circe tricks them and the story ends in a macabre way witch
cooking the children in oven and eating them.

Paragraph 5:
The characters in the novel are:
Hans, Young but stupid little boy
Gretel, Young little girl, Hans's sister
Circe, The evil, malicious old witch

Paragraph 6:
The context of the story is: It is a dark stormy winter night.
The full moon is shining bright and glowing light
on the snow, as it is winter. It is very cold, -20
Celsius degrees. The setting is in the middle of
a dense old forest.

Paragraph 7:
Hans and Gretel walk alone to the forest.

Paragraph 8:
They see a strange house made of candy and peppercake.

Paragraph 9:
They enter and inside the house evil witch Circe awaits them.

Paragraph 10:
Circe tricks them and the story ends in a macabre way witch
cooking the children in oven and eating them.

Paragraph 11:
The characters in the novel are:
Hans, Young but stupid little boy
Gretel, Young little girl, Hans's sister
Circe, The evil, malicious old witch

Paragraph 12:
The context of the story is: It is a dark stormy winter night.
The full moon is shining bright and glowing light
on the snow, as it is winter. It is very cold, -20
Celsius degrees. The setting is in the middle of
a dense old forest.

Paragraph 13:
Hans and Gretel walk alone to the forest.

Paragraph 14:
They see a strange house made of candy and peppercake.

Paragraph 15:
They enter and inside the house evil witch Circe awaits them.

Paragraph 16:
Circe tricks them and the story ends in a macabre way witch
cooking the children in oven and eating them."

I used Google Colab btw !

Great work, thanks for your trouble and advice!

In case it's useful, I've had some luck just adding "\n\n" as a stop token. This keeps it from rambling pretty well. Yet, surprisingly it will still find a way to print out short Python code snippets by just not leaving any empty lines (it uses only one "\n" at a time). Let me know if that works for anyone else. I'm sure it can stunt it for some use cases but seems to be working well for my chatbot purposes.

Alternatively if you're getting common ramblings like "exercise 3:" maybe try adding "\nexercise" to the array of stop tokens. Or "##" to prevent those textbook headers from popping up. But I've had good luck adding only "\n\n".

I'm also trying to figure out a good prompt to guide it to always answer with the fewest words so a conversation can go faster, if anyone has any ideas.

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