Ollama 模型文件
NOTE
Modelfile
语法正在开发中
模型文件是创建和共享 Ollama 模型的蓝图。
目录
格式
Modelfile
的格式:
modelfile
# comment
INSTRUCTION arguments
Instruction | Description |
---|---|
FROM (required) | Defines the base model to use. |
PARAMETER | Sets the parameters for how Ollama will run the model. |
TEMPLATE | The full prompt template to be sent to the model. |
SYSTEM | Specifies the system message that will be set in the template. |
ADAPTER | Defines the (Q)LoRA adapters to apply to the model. |
LICENSE | Specifies the legal license. |
MESSAGE | Specify message history. |
示例
基本 Modelfile
一个创建马里奥蓝图的 Modelfile
示例:
modelfile
FROM llama3.2
# sets the temperature to 1 [higher is more creative, lower is more coherent]
PARAMETER temperature 1
# sets the context window size to 4096, this controls how many tokens the LLM can use as context to generate the next token
PARAMETER num_ctx 4096
# sets a custom system message to specify the behavior of the chat assistant
SYSTEM You are Mario from super mario bros, acting as an assistant.
要使用这个:
- 将其保存为文件(例如
Modelfile
) ollama create choose-a-model-name -f <location of the file e.g. ./Modelfile>'
ollama run choose-a-model-name
- 开始使用模型!
更多示例可在示例目录中找到。
要查看给定模型的Modelfile,请使用ollama show --modelfile
命令。
bash
> ollama show --modelfile llama3.2
# Modelfile generated by "ollama show"
# To build a new Modelfile based on this one, replace the FROM line with:
# FROM llama3.2:latest
FROM /Users/pdevine/.ollama/models/blobs/sha256-00e1317cbf74d901080d7100f57580ba8dd8de57203072dc6f668324ba545f29
TEMPLATE """{{ if .System }}<|start_header_id|>system<|end_header_id|>
{{ .System }}<|eot_id|>{{ end }}{{ if .Prompt }}<|start_header_id|>user<|end_header_id|>
{{ .Prompt }}<|eot_id|>{{ end }}<|start_header_id|>assistant<|end_header_id|>
{{ .Response }}<|eot_id|>"""
PARAMETER stop "<|start_header_id|>"
PARAMETER stop "<|end_header_id|>"
PARAMETER stop "<|eot_id|>"
PARAMETER stop "<|reserved_special_token"
指令
FROM(必需)
FROM
指令定义了在创建模型时要使用的基础模型。
modelfile
FROM <model name>:<tag>
基于现有模型构建
modelfile
FROM llama3.2
可用的基础模型列表:
https://github.com/ollama/ollama#model-library 可以在以下位置找到其他模型: https://ollama.com/library
从Safetensors模型构建
modelfile
FROM <model directory>
模型目录应包含支持架构的 Safetensors 权重。
目前支持的模型架构:
- Llama(包括 Llama 2、Llama 3、Llama 3.1 和 Llama 3.2)
- Mistral(包括 Mistral 1、Mistral 2 和 Mixtral)
- Gemma(包括 Gemma 1 和 Gemma 2)
- Phi3
从GGUF文件构建
modelfile
FROM ./ollama-model.gguf
GGUF 文件的位置应指定为绝对路径或相对于 Modelfile
的位置。
参数
PARAMETER
指令定义了一个在运行模型时可以设置的参数。
modelfile
PARAMETER <parameter> <parametervalue>
有效的参数和值
Parameter | Description | Value Type | Example Usage |
---|---|---|---|
mirostat | Enable Mirostat sampling for controlling perplexity. (default: 0, 0 = disabled, 1 = Mirostat, 2 = Mirostat 2.0) | int | mirostat 0 |
mirostat_eta | Influences how quickly the algorithm responds to feedback from the generated text. A lower learning rate will result in slower adjustments, while a higher learning rate will make the algorithm more responsive. (Default: 0.1) | float | mirostat_eta 0.1 |
mirostat_tau | Controls the balance between coherence and diversity of the output. A lower value will result in more focused and coherent text. (Default: 5.0) | float | mirostat_tau 5.0 |
num_ctx | Sets the size of the context window used to generate the next token. (Default: 2048) | int | num_ctx 4096 |
repeat_last_n | Sets how far back for the model to look back to prevent repetition. (Default: 64, 0 = disabled, -1 = num_ctx) | int | repeat_last_n 64 |
repeat_penalty | Sets how strongly to penalize repetitions. A higher value (e.g., 1.5) will penalize repetitions more strongly, while a lower value (e.g., 0.9) will be more lenient. (Default: 1.1) | float | repeat_penalty 1.1 |
temperature | The temperature of the model. Increasing the temperature will make the model answer more creatively. (Default: 0.8) | float | temperature 0.7 |
seed | Sets the random number seed to use for generation. Setting this to a specific number will make the model generate the same text for the same prompt. (Default: 0) | int | seed 42 |
stop | Sets the stop sequences to use. When this pattern is encountered the LLM will stop generating text and return. Multiple stop patterns may be set by specifying multiple separate stop parameters in a modelfile. | string | stop "AI assistant:" |
tfs_z | Tail free sampling is used to reduce the impact of less probable tokens from the output. A higher value (e.g., 2.0) will reduce the impact more, while a value of 1.0 disables this setting. (default: 1) | float | tfs_z 1 |
num_predict | Maximum number of tokens to predict when generating text. (Default: 128, -1 = infinite generation, -2 = fill context) | int | num_predict 42 |
top_k | Reduces the probability of generating nonsense. A higher value (e.g. 100) will give more diverse answers, while a lower value (e.g. 10) will be more conservative. (Default: 40) | int | top_k 40 |
top_p | Works together with top-k. A higher value (e.g., 0.95) will lead to more diverse text, while a lower value (e.g., 0.5) will generate more focused and conservative text. (Default: 0.9) | float | top_p 0.9 |
min_p | Alternative to the top_p, and aims to ensure a balance of quality and variety. The parameter p represents the minimum probability for a token to be considered, relative to the probability of the most likely token. For example, with p=0.05 and the most likely token having a probability of 0.9, logits with a value less than 0.045 are filtered out. (Default: 0.0) | float | min_p 0.05 |
模板
要传递给模型的完整提示模板 TEMPLATE
。它可能包括(可选)系统消息、用户消息和模型的响应。注意:语法可能是模型特定的。模板使用 Go 模板语法。
模板变量
Role | Description |
---|---|
system | 为模型提供 SYSTEM 消息的另一种方式 |
user | 用户可能会问的示例消息 |
assistant | 模型应该如何回应的示例消息 |
TEMPLATE """{{ if .System }}<|im_start|>system
{{ .System }}<|im_end|>
{{ end }}{{ if .Prompt }}<|im_start|>user
{{ .Prompt }}<|im_end|>
{{ end }}<|im_start|>assistant
"""
SYSTEM
SYSTEM
指令指定了模板中要使用的系统消息(如果适用)。
modelfile
SYSTEM """<system message>"""
ADAPTER
ADAPTER
指令指定了一个应应用于基础模型的微调 LoRA 适配器。适配器的值应为绝对路径或相对于 Modelfile 的路径。基础模型应使用 FROM
指令指定。如果基础模型与适配器微调时所用的基础模型不同,行为将不可预测。
Safetensor 适配器
modelfile
ADAPTER <path to safetensor adapter>
目前支持的 Safetensor 适配器:
- Llama(包括 Llama 2、Llama 3 和 Llama 3.1)
- Mistral(包括 Mistral 1、Mistral 2 和 Mixtral)
- Gemma(包括 Gemma 1 和 Gemma 2)
GGUF 适配器
modelfile
ADAPTER ./ollama-lora.gguf
许可证
LICENSE
指令允许你指定与此 Modelfile 一起使用的模型的共享或分发所依据的法律许可证。
modelfile
LICENSE """
<license text>
"""
MESSAGE
MESSAGE
指令允许你为模型指定消息历史,以便模型在响应时使用。通过多次使用 MESSAGE
命令来构建对话,可以引导模型以类似的方式回答。
modelfile
MESSAGE <role> <message>
有效的角色
Role | Description |
---|---|
system | Alternate way of providing the SYSTEM message for the model. |
user | An example message of what the user could have asked. |
assistant | An example message of how the model should respond. |
示例对话
modelfile
MESSAGE user Is Toronto in Canada?
MESSAGE assistant yes
MESSAGE user Is Sacramento in Canada?
MESSAGE assistant no
MESSAGE user Is Ontario in Canada?
MESSAGE assistant yes
注意事项
Modelfile
不区分大小写。在示例中,使用大写指令是为了更容易区分它与参数。- 指令可以按任意顺序排列。在示例中,
FROM
指令放在首位是为了保持可读性。