LocalAI/pkg/model/loader.go
2023-05-02 16:07:18 +02:00

287 lines
7.6 KiB
Go

package model
import (
"bytes"
"fmt"
"io/ioutil"
"os"
"path/filepath"
"strings"
"sync"
"text/template"
"github.com/rs/zerolog/log"
gpt2 "github.com/go-skynet/go-gpt2.cpp"
gptj "github.com/go-skynet/go-gpt4all-j.cpp"
llama "github.com/go-skynet/go-llama.cpp"
)
type ModelLoader struct {
ModelPath string
mu sync.Mutex
models map[string]*llama.LLama
gptmodels map[string]*gptj.GPTJ
gpt2models map[string]*gpt2.GPT2
gptstablelmmodels map[string]*gpt2.StableLM
promptsTemplates map[string]*template.Template
}
func NewModelLoader(modelPath string) *ModelLoader {
return &ModelLoader{
ModelPath: modelPath,
gpt2models: make(map[string]*gpt2.GPT2),
gptmodels: make(map[string]*gptj.GPTJ),
gptstablelmmodels: make(map[string]*gpt2.StableLM),
models: make(map[string]*llama.LLama),
promptsTemplates: make(map[string]*template.Template),
}
}
func (ml *ModelLoader) ExistsInModelPath(s string) bool {
_, err := os.Stat(filepath.Join(ml.ModelPath, s))
return err == nil
}
func (ml *ModelLoader) ListModels() ([]string, error) {
files, err := ioutil.ReadDir(ml.ModelPath)
if err != nil {
return []string{}, err
}
models := []string{}
for _, file := range files {
// Skip templates, YAML and .keep files
if strings.HasSuffix(file.Name(), ".tmpl") || strings.HasSuffix(file.Name(), ".keep") || strings.HasSuffix(file.Name(), ".yaml") || strings.HasSuffix(file.Name(), ".yml") {
continue
}
models = append(models, file.Name())
}
return models, nil
}
func (ml *ModelLoader) TemplatePrefix(modelName string, in interface{}) (string, error) {
ml.mu.Lock()
defer ml.mu.Unlock()
m, ok := ml.promptsTemplates[modelName]
if !ok {
modelFile := filepath.Join(ml.ModelPath, modelName)
if err := ml.loadTemplateIfExists(modelName, modelFile); err != nil {
return "", err
}
t, exists := ml.promptsTemplates[modelName]
if exists {
m = t
}
}
if m == nil {
return "", nil
}
var buf bytes.Buffer
if err := m.Execute(&buf, in); err != nil {
return "", err
}
return buf.String(), nil
}
func (ml *ModelLoader) loadTemplateIfExists(modelName, modelFile string) error {
// Check if the template was already loaded
if _, ok := ml.promptsTemplates[modelName]; ok {
return nil
}
// Check if the model path exists
// skip any error here - we run anyway if a template does not exist
modelTemplateFile := fmt.Sprintf("%s.tmpl", modelName)
if !ml.ExistsInModelPath(modelTemplateFile) {
return nil
}
dat, err := os.ReadFile(filepath.Join(ml.ModelPath, modelTemplateFile))
if err != nil {
return err
}
// Parse the template
tmpl, err := template.New("prompt").Parse(string(dat))
if err != nil {
return err
}
ml.promptsTemplates[modelName] = tmpl
return nil
}
func (ml *ModelLoader) LoadStableLMModel(modelName string) (*gpt2.StableLM, error) {
ml.mu.Lock()
defer ml.mu.Unlock()
// Check if we already have a loaded model
if !ml.ExistsInModelPath(modelName) {
return nil, fmt.Errorf("model does not exist")
}
if m, ok := ml.gptstablelmmodels[modelName]; ok {
log.Debug().Msgf("Model already loaded in memory: %s", modelName)
return m, nil
}
// Load the model and keep it in memory for later use
modelFile := filepath.Join(ml.ModelPath, modelName)
log.Debug().Msgf("Loading model in memory from file: %s", modelFile)
model, err := gpt2.NewStableLM(modelFile)
if err != nil {
return nil, err
}
// If there is a prompt template, load it
if err := ml.loadTemplateIfExists(modelName, modelFile); err != nil {
return nil, err
}
ml.gptstablelmmodels[modelName] = model
return model, err
}
func (ml *ModelLoader) LoadGPT2Model(modelName string) (*gpt2.GPT2, error) {
ml.mu.Lock()
defer ml.mu.Unlock()
// Check if we already have a loaded model
if !ml.ExistsInModelPath(modelName) {
return nil, fmt.Errorf("model does not exist")
}
if m, ok := ml.gpt2models[modelName]; ok {
log.Debug().Msgf("Model already loaded in memory: %s", modelName)
return m, nil
}
// TODO: This needs refactoring, it's really bad to have it in here
// Check if we have a GPTStable model loaded instead - if we do we return an error so the API tries with StableLM
if _, ok := ml.gptstablelmmodels[modelName]; ok {
log.Debug().Msgf("Model is GPTStableLM: %s", modelName)
return nil, fmt.Errorf("this model is a GPTStableLM one")
}
// Load the model and keep it in memory for later use
modelFile := filepath.Join(ml.ModelPath, modelName)
log.Debug().Msgf("Loading model in memory from file: %s", modelFile)
model, err := gpt2.New(modelFile)
if err != nil {
return nil, err
}
// If there is a prompt template, load it
if err := ml.loadTemplateIfExists(modelName, modelFile); err != nil {
return nil, err
}
ml.gpt2models[modelName] = model
return model, err
}
func (ml *ModelLoader) LoadGPTJModel(modelName string) (*gptj.GPTJ, error) {
ml.mu.Lock()
defer ml.mu.Unlock()
// Check if we already have a loaded model
if !ml.ExistsInModelPath(modelName) {
return nil, fmt.Errorf("model does not exist")
}
if m, ok := ml.gptmodels[modelName]; ok {
log.Debug().Msgf("Model already loaded in memory: %s", modelName)
return m, nil
}
// TODO: This needs refactoring, it's really bad to have it in here
// Check if we have a GPT2 model loaded instead - if we do we return an error so the API tries with GPT2
if _, ok := ml.gpt2models[modelName]; ok {
log.Debug().Msgf("Model is GPT2: %s", modelName)
return nil, fmt.Errorf("this model is a GPT2 one")
}
if _, ok := ml.gptstablelmmodels[modelName]; ok {
log.Debug().Msgf("Model is GPTStableLM: %s", modelName)
return nil, fmt.Errorf("this model is a GPTStableLM one")
}
// Load the model and keep it in memory for later use
modelFile := filepath.Join(ml.ModelPath, modelName)
log.Debug().Msgf("Loading model in memory from file: %s", modelFile)
model, err := gptj.New(modelFile)
if err != nil {
return nil, err
}
// If there is a prompt template, load it
if err := ml.loadTemplateIfExists(modelName, modelFile); err != nil {
return nil, err
}
ml.gptmodels[modelName] = model
return model, err
}
func (ml *ModelLoader) LoadLLaMAModel(modelName string, opts ...llama.ModelOption) (*llama.LLama, error) {
ml.mu.Lock()
defer ml.mu.Unlock()
log.Debug().Msgf("Loading model name: %s", modelName)
// Check if we already have a loaded model
if !ml.ExistsInModelPath(modelName) {
return nil, fmt.Errorf("model does not exist")
}
if m, ok := ml.models[modelName]; ok {
log.Debug().Msgf("Model already loaded in memory: %s", modelName)
return m, nil
}
// TODO: This needs refactoring, it's really bad to have it in here
// Check if we have a GPTJ model loaded instead - if we do we return an error so the API tries with GPTJ
if _, ok := ml.gptmodels[modelName]; ok {
log.Debug().Msgf("Model is GPTJ: %s", modelName)
return nil, fmt.Errorf("this model is a GPTJ one")
}
if _, ok := ml.gpt2models[modelName]; ok {
log.Debug().Msgf("Model is GPT2: %s", modelName)
return nil, fmt.Errorf("this model is a GPT2 one")
}
if _, ok := ml.gptstablelmmodels[modelName]; ok {
log.Debug().Msgf("Model is GPTStableLM: %s", modelName)
return nil, fmt.Errorf("this model is a GPTStableLM one")
}
// Load the model and keep it in memory for later use
modelFile := filepath.Join(ml.ModelPath, modelName)
log.Debug().Msgf("Loading model in memory from file: %s", modelFile)
model, err := llama.New(modelFile, opts...)
if err != nil {
return nil, err
}
// If there is a prompt template, load it
if err := ml.loadTemplateIfExists(modelName, modelFile); err != nil {
return nil, err
}
ml.models[modelName] = model
return model, err
}