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109 lines
3.0 KiB
Go
109 lines
3.0 KiB
Go
package gpt4all
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// #cgo CFLAGS: -I${SRCDIR}../../gpt4all-backend/ -I${SRCDIR}../../gpt4all-backend/llama.cpp -I./
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// #cgo CXXFLAGS: -std=c++17 -I${SRCDIR}../../gpt4all-backend/ -I${SRCDIR}../../gpt4all-backend/llama.cpp -I./
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// #cgo darwin LDFLAGS: -framework Accelerate
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// #cgo darwin CXXFLAGS: -std=c++17
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// #cgo LDFLAGS: -lgpt4all -lm -lstdc++ -ldl
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// void* load_model(const char *fname, int n_threads);
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// void model_prompt( const char *prompt, void *m, char* result, int repeat_last_n, float repeat_penalty, int n_ctx, int tokens, int top_k,
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// float top_p, float temp, int n_batch,float ctx_erase);
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// void free_model(void *state_ptr);
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// extern unsigned char getTokenCallback(void *, char *);
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// void llmodel_set_implementation_search_path(const char *path);
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import "C"
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import (
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"fmt"
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"runtime"
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"strings"
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"sync"
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"unsafe"
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)
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// The following code is https://github.com/go-skynet/go-llama.cpp with small adaptations
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type Model struct {
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state unsafe.Pointer
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}
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func New(model string, opts ...ModelOption) (*Model, error) {
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ops := NewModelOptions(opts...)
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if ops.LibrarySearchPath != "" {
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C.llmodel_set_implementation_search_path(C.CString(ops.LibrarySearchPath))
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}
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state := C.load_model(C.CString(model), C.int(ops.Threads))
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if state == nil {
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return nil, fmt.Errorf("failed loading model")
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}
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gpt := &Model{state: state}
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// set a finalizer to remove any callbacks when the struct is reclaimed by the garbage collector.
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runtime.SetFinalizer(gpt, func(g *Model) {
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setTokenCallback(g.state, nil)
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})
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return gpt, nil
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}
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func (l *Model) Predict(text string, opts ...PredictOption) (string, error) {
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po := NewPredictOptions(opts...)
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input := C.CString(text)
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if po.Tokens == 0 {
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po.Tokens = 99999999
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}
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out := make([]byte, po.Tokens)
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C.model_prompt(input, l.state, (*C.char)(unsafe.Pointer(&out[0])), C.int(po.RepeatLastN), C.float(po.RepeatPenalty), C.int(po.ContextSize),
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C.int(po.Tokens), C.int(po.TopK), C.float(po.TopP), C.float(po.Temperature), C.int(po.Batch), C.float(po.ContextErase))
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res := C.GoString((*C.char)(unsafe.Pointer(&out[0])))
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res = strings.TrimPrefix(res, " ")
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res = strings.TrimPrefix(res, text)
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res = strings.TrimPrefix(res, "\n")
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res = strings.TrimSuffix(res, "<|endoftext|>")
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return res, nil
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}
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func (l *Model) Free() {
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C.free_model(l.state)
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}
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func (l *Model) SetTokenCallback(callback func(token string) bool) {
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setTokenCallback(l.state, callback)
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}
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var (
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m sync.Mutex
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callbacks = map[uintptr]func(string) bool{}
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)
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//export getTokenCallback
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func getTokenCallback(statePtr unsafe.Pointer, token *C.char) bool {
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m.Lock()
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defer m.Unlock()
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if callback, ok := callbacks[uintptr(statePtr)]; ok {
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return callback(C.GoString(token))
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}
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return true
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}
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// setCallback can be used to register a token callback for LLama. Pass in a nil callback to
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// remove the callback.
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func setTokenCallback(statePtr unsafe.Pointer, callback func(string) bool) {
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m.Lock()
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defer m.Unlock()
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if callback == nil {
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delete(callbacks, uintptr(statePtr))
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} else {
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callbacks[uintptr(statePtr)] = callback
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}
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}
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