llama.go 9.36 KB
Newer Older
Jeffrey Morgan's avatar
Jeffrey Morgan committed
1
2
package llama

Michael Yang's avatar
Michael Yang committed
3
/*
Michael Yang's avatar
Michael Yang committed
4
5
#cgo CPPFLAGS: -O3 -Wall -Wextra -Werror -Wno-unused-function -Wno-unused-variable -DNDEBUG -DGGML_USE_K_QUANTS
#cgo CXXFLAGS: -std=gnu++11
Michael Yang's avatar
Michael Yang committed
6
#cgo darwin CPPFLAGS: -DGGML_USE_ACCELERATE -DGGML_USE_METAL -DGGML_METAL_NDEBUG
Michael Yang's avatar
Michael Yang committed
7
8
9
10
11
12
13
14
15
16
17
18
19
20
21
22
23
#cgo darwin LDFLAGS: -framework Accelerate -framework Foundation -framework Metal -framework MetalKit -framework MetalPerformanceShaders
#include <stdlib.h>
#include "llama.h"

struct llama_sample_options
{
	float repeat_penalty;
	float frequency_penalty;
	float presence_penalty;
	float temperature;
	int32_t top_k;
	float top_p;
	float tfs_z;
	float typical_p;
	int mirostat;
	float mirostat_tau;
	float mirostat_eta;
Michael Yang's avatar
Michael Yang committed
24
	bool penalize_newline;
Michael Yang's avatar
Michael Yang committed
25
26
27
28
29
30
31
32
33
34
35
36
37
38
39
40
};

llama_token llama_sample(
		struct llama_context *ctx,
		struct llama_token_data *candidates,
		size_t n_candidates,
		const llama_token *last_tokens,
		size_t n_last_tokens,
		struct llama_sample_options *opts)
{
	llama_token_data_array candidates_p = {
		candidates,
		n_candidates,
		false,
	};

Michael Yang's avatar
Michael Yang committed
41
42
	struct llama_token_data newline = candidates_p.data[llama_token_nl()];

Michael Yang's avatar
Michael Yang committed
43
44
45
46
47
48
49
50
51
52
	llama_sample_repetition_penalty(
		ctx, &candidates_p,
		last_tokens, n_last_tokens,
		opts->repeat_penalty);

	llama_sample_frequency_and_presence_penalties(
		ctx, &candidates_p,
		last_tokens, n_last_tokens,
		opts->frequency_penalty, opts->presence_penalty);

Michael Yang's avatar
Michael Yang committed
53
54
55
56
	if (!opts->penalize_newline) {
		candidates_p.data[llama_token_nl()] = newline;
	}

Michael Yang's avatar
Michael Yang committed
57
58
59
	if (opts->temperature <= 0) {
		return llama_sample_token_greedy(ctx, &candidates_p);
	}
Bruce MacDonald's avatar
Bruce MacDonald committed
60

Michael Yang's avatar
Michael Yang committed
61
62
63
64
65
66
67
68
69
70
71
72
73
74
75
76
77
78
79
80
81
82
83
84
85
86
	if (opts->mirostat == 1) {
		int mirostat_m = 100;
		float mirostat_mu = 2.0f * opts->mirostat_tau;
		llama_sample_temperature(ctx, &candidates_p, opts->temperature);
		return llama_sample_token_mirostat(
			ctx, &candidates_p,
			opts->mirostat_tau, opts->mirostat_eta,
			mirostat_m, &mirostat_mu);
	} else if (opts->mirostat == 2) {
		float mirostat_mu = 2.0f * opts->mirostat_tau;
		llama_sample_temperature(ctx, &candidates_p, opts->temperature);
		return llama_sample_token_mirostat_v2(
			ctx, &candidates_p,
			opts->mirostat_tau, opts->mirostat_eta,
			&mirostat_mu);
	} else {
		llama_sample_top_k(ctx, &candidates_p, opts->top_k, 1);
		llama_sample_tail_free(ctx, &candidates_p, opts->tfs_z, 1);
		llama_sample_typical(ctx, &candidates_p, opts->typical_p, 1);
		llama_sample_top_p(ctx, &candidates_p, opts->top_p, 1);
		llama_sample_temperature(ctx, &candidates_p, opts->temperature);
		return llama_sample_token(ctx, &candidates_p);
	}
}
*/
import "C"
Jeffrey Morgan's avatar
Jeffrey Morgan committed
87
import (
Michael Yang's avatar
Michael Yang committed
88
	"bytes"
Michael Yang's avatar
Michael Yang committed
89
	"errors"
90
	"fmt"
Michael Yang's avatar
Michael Yang committed
91
	"io"
Michael Yang's avatar
Michael Yang committed
92
	"log"
Michael Yang's avatar
Michael Yang committed
93
	"os"
Jeffrey Morgan's avatar
Jeffrey Morgan committed
94
	"strings"
Michael Yang's avatar
Michael Yang committed
95
	"sync"
Michael Yang's avatar
Michael Yang committed
96
	"unicode/utf8"
Jeffrey Morgan's avatar
Jeffrey Morgan committed
97
	"unsafe"
Michael Yang's avatar
Michael Yang committed
98
99

	"github.com/jmorganca/ollama/api"
Jeffrey Morgan's avatar
Jeffrey Morgan committed
100
101
)

Michael Yang's avatar
Michael Yang committed
102
type LLM struct {
Michael Yang's avatar
Michael Yang committed
103
104
105
	params *C.struct_llama_context_params
	model  *C.struct_llama_model
	ctx    *C.struct_llama_context
Jeffrey Morgan's avatar
Jeffrey Morgan committed
106

Michael Yang's avatar
Michael Yang committed
107
108
109
110
	last   []C.llama_token
	embd   []C.llama_token
	cursor int

Michael Yang's avatar
Michael Yang committed
111
112
113
	mu sync.Mutex
	gc bool

Michael Yang's avatar
Michael Yang committed
114
115
	api.Options
}
Jeffrey Morgan's avatar
Jeffrey Morgan committed
116

Michael Yang's avatar
Michael Yang committed
117
func New(model string, opts api.Options) (*LLM, error) {
Michael Yang's avatar
Michael Yang committed
118
119
	if _, err := os.Stat(model); err != nil {
		return nil, err
Jeffrey Morgan's avatar
Jeffrey Morgan committed
120
121
	}

Michael Yang's avatar
Michael Yang committed
122
	llm := LLM{Options: opts}
Michael Yang's avatar
Michael Yang committed
123

Michael Yang's avatar
Michael Yang committed
124
	C.llama_backend_init(C.bool(llm.UseNUMA))
Michael Yang's avatar
Michael Yang committed
125
126
127
128
129
130
131
132
133
134
135
136
137
138
139
140
141
142
143
144

	params := C.llama_context_default_params()
	params.seed = C.uint(llm.Seed)
	params.n_ctx = C.int(llm.NumCtx)
	params.n_batch = C.int(llm.NumBatch)
	params.n_gpu_layers = C.int(llm.NumGPU)
	params.main_gpu = C.int(llm.MainGPU)
	params.low_vram = C.bool(llm.LowVRAM)
	params.f16_kv = C.bool(llm.F16KV)
	params.logits_all = C.bool(llm.LogitsAll)
	params.vocab_only = C.bool(llm.VocabOnly)
	params.use_mmap = C.bool(llm.UseMMap)
	params.use_mlock = C.bool(llm.UseMLock)
	params.embedding = C.bool(llm.EmbeddingOnly)
	llm.params = &params

	cModel := C.CString(model)
	defer C.free(unsafe.Pointer(cModel))

	llm.model = C.llama_load_model_from_file(cModel, params)
145
146
147
148
	if llm.model == nil {
		return nil, errors.New("failed to load model")
	}

Michael Yang's avatar
Michael Yang committed
149
	llm.ctx = C.llama_new_context_with_model(llm.model, params)
150
151
152
	if llm.ctx == nil {
		return nil, errors.New("failed to create context")
	}
Michael Yang's avatar
Michael Yang committed
153
154
155
156
157
158
159

	// warm up the model
	bos := []C.llama_token{C.llama_token_bos()}
	C.llama_eval(llm.ctx, unsafe.SliceData(bos), C.int(len(bos)), 0, C.int(opts.NumThread))
	C.llama_reset_timings(llm.ctx)

	return &llm, nil
Jeffrey Morgan's avatar
Jeffrey Morgan committed
160
161
}

Michael Yang's avatar
Michael Yang committed
162
func (llm *LLM) Close() {
Michael Yang's avatar
Michael Yang committed
163
164
165
166
167
	llm.gc = true

	llm.mu.Lock()
	defer llm.mu.Unlock()

Michael Yang's avatar
Michael Yang committed
168
169
170
171
	defer C.llama_free_model(llm.model)
	defer C.llama_free(llm.ctx)

	C.llama_print_timings(llm.ctx)
Jeffrey Morgan's avatar
Jeffrey Morgan committed
172
173
}

Michael Yang's avatar
Michael Yang committed
174
func (llm *LLM) Predict(ctx []int, prompt string, fn func(api.GenerateResponse)) error {
Michael Yang's avatar
Michael Yang committed
175
176
177
	llm.mu.Lock()
	defer llm.mu.Unlock()

Michael Yang's avatar
Michael Yang committed
178
179
180
181
182
183
184
185
186
187
188
189
190
191
192
193
194
195
196
197
198
199
	C.llama_reset_timings(llm.ctx)

	tokens := make([]C.llama_token, len(ctx))
	for i := range tokens {
		tokens[i] = C.llama_token(ctx[i])
	}

	if len(tokens) == 0 {
		tokens = llm.tokenize(" ")
	}

	llm.marshalPrompt(tokens, prompt)

	C.llama_set_rng_seed(llm.ctx, C.uint(llm.Seed))

	var b bytes.Buffer
	for {
		token, err := llm.next()
		if errors.Is(err, io.EOF) {
			break
		} else if err != nil {
			return err
Michael Yang's avatar
Michael Yang committed
200
201
		} else if llm.gc {
			return io.EOF
Michael Yang's avatar
Michael Yang committed
202
203
204
205
206
207
		}

		b.WriteString(llm.detokenize(token))
		if utf8.Valid(b.Bytes()) || b.Len() >= utf8.UTFMax {
			fn(api.GenerateResponse{Response: b.String()})
			b.Reset()
Michael Yang's avatar
Michael Yang committed
208
		}
Michael Yang's avatar
Michael Yang committed
209
	}
Michael Yang's avatar
Michael Yang committed
210

Michael Yang's avatar
Michael Yang committed
211
212
213
214
215
	last := make([]int, 0, len(llm.last))
	for _, i := range llm.last {
		if i != 0 {
			last = append(last, int(i))
		}
Jeffrey Morgan's avatar
Jeffrey Morgan committed
216
217
	}

Michael Yang's avatar
Michael Yang committed
218
219
220
221
222
223
224
225
226
227
228
229
230
231
232
233
234
235
236
237
238
239
240
241
242
243
244
245
246
247
248
249
250
251
252
253
254
255
256
257
258
259
260
261
262
263
264
265
266
267
268
269
270
271
	timings := C.llama_get_timings(llm.ctx)
	fn(api.GenerateResponse{
		Done:               true,
		Context:            last,
		PromptEvalCount:    int(timings.n_p_eval),
		PromptEvalDuration: parseDurationMs(float64(timings.t_p_eval_ms)),
		EvalCount:          int(timings.n_eval),
		EvalDuration:       parseDurationMs(float64(timings.t_eval_ms)),
	})

	return nil
}

func (llm *LLM) marshalPrompt(ctx []C.llama_token, prompt string) []C.llama_token {
	tokens := append(ctx, llm.tokenize(prompt)...)
	if llm.NumKeep < 0 {
		llm.NumKeep = len(tokens)
	}

	// min(llm.NumCtx - 4, llm.NumKeep)
	if llm.NumCtx-4 < llm.NumKeep {
		llm.NumKeep = llm.NumCtx - 4
	}

	if len(tokens) >= llm.NumCtx {
		// truncate input
		numLeft := (llm.NumCtx - llm.NumKeep) / 2
		truncated := tokens[:llm.NumKeep]
		erasedBlocks := (len(tokens) - llm.NumKeep - numLeft - 1) / numLeft
		truncated = append(truncated, tokens[llm.NumKeep+erasedBlocks*numLeft:]...)
		copy(llm.last, tokens[len(tokens)-llm.NumCtx:])

		tokens = truncated
		log.Printf("input truncated: num_ctx=%d num_keep=%d num_left=%d num_tokens=%d", llm.NumCtx, llm.NumKeep, numLeft, len(truncated))
	} else {
		llm.last = make([]C.llama_token, llm.NumCtx-len(tokens))
		llm.last = append(llm.last, tokens...)
	}

	var i int
	for i = 0; i < len(llm.embd) && i < len(tokens) && llm.embd[i] == tokens[i]; i++ {
		// noop
	}

	llm.embd = tokens
	if i == len(tokens) {
		// evaluate at least one token to generate logits
		i--
	}

	llm.cursor = i

	log.Printf("prompt: num_past=%d cached=%v eval=%v", i, len(llm.embd[:i]), len(llm.embd[i:]))
	return tokens
Michael Yang's avatar
Michael Yang committed
272
}
Michael Yang's avatar
Michael Yang committed
273

Michael Yang's avatar
Michael Yang committed
274
func (llm *LLM) tokenize(prompt string) []C.llama_token {
Michael Yang's avatar
Michael Yang committed
275
276
	cPrompt := C.CString(prompt)
	defer C.free(unsafe.Pointer(cPrompt))
Michael Yang's avatar
Michael Yang committed
277

278
	tokens := make([]C.llama_token, len(prompt)+1)
Michael Yang's avatar
Michael Yang committed
279
280
	if n := C.llama_tokenize(llm.ctx, cPrompt, unsafe.SliceData(tokens), C.int(len(tokens)), true); n > 0 {
		return tokens[:n]
Jeffrey Morgan's avatar
Jeffrey Morgan committed
281
282
283
284
285
	}

	return nil
}

Michael Yang's avatar
Michael Yang committed
286
func (llm *LLM) detokenize(tokens ...C.llama_token) string {
Michael Yang's avatar
Michael Yang committed
287
288
289
	var sb strings.Builder
	for _, token := range tokens {
		sb.WriteString(C.GoString(C.llama_token_to_str(llm.ctx, token)))
Jeffrey Morgan's avatar
Jeffrey Morgan committed
290
291
	}

Michael Yang's avatar
Michael Yang committed
292
	return sb.String()
Jeffrey Morgan's avatar
Jeffrey Morgan committed
293
294
}

Michael Yang's avatar
Michael Yang committed
295
296
297
298
299
func (llm *LLM) next() (C.llama_token, error) {
	if len(llm.embd) >= llm.NumCtx {
		numLeft := (llm.NumCtx - llm.NumKeep) / 2
		truncated := llm.embd[:llm.NumKeep]
		truncated = append(truncated, llm.embd[len(llm.embd)-numLeft:]...)
Michael Yang's avatar
Michael Yang committed
300

Michael Yang's avatar
Michael Yang committed
301
302
303
304
		llm.embd = truncated
		llm.cursor = llm.NumKeep
		log.Printf("input truncated: num_ctx=%d num_keep=%d num_left=%d num_tokens=%d cursor=%d", llm.NumCtx, llm.NumKeep, numLeft, len(truncated), llm.cursor)
	}
Michael Yang's avatar
Michael Yang committed
305

Michael Yang's avatar
Michael Yang committed
306
307
	for {
		if llm.cursor >= len(llm.embd) {
308
			break
Michael Yang's avatar
Michael Yang committed
309
310
		}

Michael Yang's avatar
Michael Yang committed
311
312
313
		numEval := len(llm.embd) - llm.cursor
		if numEval > llm.NumBatch {
			numEval = llm.NumBatch
Michael Yang's avatar
Michael Yang committed
314
		}
315

Michael Yang's avatar
Michael Yang committed
316
317
		if retval := C.llama_eval(llm.ctx, unsafe.SliceData(llm.embd[llm.cursor:]), C.int(numEval), C.int(llm.cursor), C.int(llm.NumThread)); retval != 0 {
			return 0, fmt.Errorf("llama_eval: %d", retval)
318
		}
Michael Yang's avatar
Michael Yang committed
319

Michael Yang's avatar
Michael Yang committed
320
		llm.cursor += numEval
Jeffrey Morgan's avatar
Jeffrey Morgan committed
321
322
	}

Michael Yang's avatar
Michael Yang committed
323
324
325
326
327
328
329
330
331
332
333
334
335
336
337
	var sampleOpts C.struct_llama_sample_options
	sampleOpts.repeat_penalty = C.float(llm.RepeatPenalty)
	sampleOpts.frequency_penalty = C.float(llm.FrequencyPenalty)
	sampleOpts.presence_penalty = C.float(llm.PresencePenalty)
	sampleOpts.temperature = C.float(llm.Temperature)
	sampleOpts.top_k = C.int(llm.TopK)
	sampleOpts.top_p = C.float(llm.TopP)
	sampleOpts.tfs_z = C.float(llm.TFSZ)
	sampleOpts.typical_p = C.float(llm.TypicalP)
	sampleOpts.mirostat = C.int(llm.Mirostat)
	sampleOpts.mirostat_tau = C.float(llm.MirostatTau)
	sampleOpts.mirostat_eta = C.float(llm.MirostatEta)
	sampleOpts.penalize_newline = C.bool(llm.PenalizeNewline)

	numVocab := C.llama_n_vocab(llm.ctx)
Michael Yang's avatar
Michael Yang committed
338
339
	logits := unsafe.Slice(C.llama_get_logits(llm.ctx), numVocab)

Michael Yang's avatar
Michael Yang committed
340
341
342
343
344
	// TODO: logit bias

	candidates := make([]C.llama_token_data, numVocab)
	for i := range logits {
		candidates[i] = C.llama_token_data{
Michael Yang's avatar
Michael Yang committed
345
346
347
			id:    C.int(i),
			logit: logits[i],
			p:     0,
Michael Yang's avatar
Michael Yang committed
348
		}
Michael Yang's avatar
Michael Yang committed
349
	}
Jeffrey Morgan's avatar
Jeffrey Morgan committed
350

Michael Yang's avatar
Michael Yang committed
351
352
353
354
355
356
357
358
359
360
361
	repeatLastN := llm.RepeatLastN
	if len(llm.last) < repeatLastN {
		repeatLastN = len(llm.last)
	}

	if llm.NumCtx < repeatLastN {
		repeatLastN = llm.NumCtx
	}

	lastN := llm.last[len(llm.last)-repeatLastN:]

Michael Yang's avatar
Michael Yang committed
362
363
	token := C.llama_sample(
		llm.ctx,
Michael Yang's avatar
Michael Yang committed
364
365
366
367
368
369
370
371
372
373
		unsafe.SliceData(candidates), C.size_t(len(candidates)),
		unsafe.SliceData(lastN), C.size_t(len(lastN)),
		&sampleOpts,
	)

	llm.last = append(llm.last, token)
	llm.embd = append(llm.embd, token)

	if token == C.llama_token_eos() {
		return 0, io.EOF
Jeffrey Morgan's avatar
Jeffrey Morgan committed
374
	}
Michael Yang's avatar
Michael Yang committed
375

Michael Yang's avatar
Michael Yang committed
376
	return token, nil
Jeffrey Morgan's avatar
Jeffrey Morgan committed
377
}