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Memory efficient context handling
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6 files changed

+180
-79
lines changed

6 files changed

+180
-79
lines changed

‎LLama.KernelMemory/BuilderExtensions.cs‎

Lines changed: 8 additions & 5 deletions
Original file line numberDiff line numberDiff line change
@@ -67,25 +67,28 @@ public static IKernelMemoryBuilder WithLLamaSharpTextGeneration(this IKernelMemo
6767
/// <param name="weights"></param>
6868
/// <param name="context"></param>
6969
/// <returns>The KernelMemoryBuilder instance with LLamaSharpTextEmbeddingGeneration and LLamaSharpTextGeneration added.</returns>
70-
public static IKernelMemoryBuilder WithLLamaSharpDefaults(this IKernelMemoryBuilder builder, LLamaSharpConfig config, LLamaWeights? weights=null, LLamaContext? context=null)
70+
public static IKernelMemoryBuilder WithLLamaSharpDefaults(this IKernelMemoryBuilder builder, LLamaSharpConfig config, LLamaWeights? weights=null)
7171
{
7272
var parameters = new ModelParams(config.ModelPath)
7373
{
7474
ContextSize = config.ContextSize ?? 2048,
7575
GpuLayerCount = config.GpuLayerCount ?? 20,
7676
MainGpu = config.MainGpu,
77-
SplitMode = config.SplitMode
77+
SplitMode = config.SplitMode,
78+
BatchSize = 512,
79+
UBatchSize = 512,
80+
FlashAttention = true,
81+
UseMemorymap = true
7882
};
7983

80-
if (weights == null || context == null)
84+
if (weights == null)
8185
{
8286
weights = LLamaWeights.LoadFromFile(parameters);
83-
context = weights.CreateContext(parameters);
8487
}
8588

8689
var executor = new StatelessExecutor(weights, parameters);
8790
builder.WithLLamaSharpTextEmbeddingGeneration(new LLamaSharpTextEmbeddingGenerator(config, weights));
88-
builder.WithLLamaSharpTextGeneration(new LlamaSharpTextGenerator(weights, context, executor, config.DefaultInferenceParams));
91+
builder.WithLLamaSharpTextGeneration(new LlamaSharpTextGenerator(weights, config, executor));
8992
return builder;
9093
}
9194
}

‎LLama.KernelMemory/LLamaSharpTextEmbeddingGenerator.cs‎

Lines changed: 12 additions & 15 deletions
Original file line numberDiff line numberDiff line change
@@ -33,9 +33,12 @@ public LLamaSharpTextEmbeddingGenerator(LLamaSharpConfig config)
3333
{
3434
ContextSize = config?.ContextSize ?? 2048,
3535
GpuLayerCount = config?.GpuLayerCount ?? 20,
36-
//Embeddings = true,
3736
MainGpu = config?.MainGpu ?? 0,
38-
SplitMode = config?.SplitMode ?? LLama.Native.GPUSplitMode.None,
37+
SplitMode = config?.SplitMode ?? LLama.Native.GPUSplitMode.Layer,
38+
BatchSize = 512,
39+
UBatchSize = 512,
40+
FlashAttention = true,
41+
UseMemorymap = true,
3942
PoolingType = LLamaPoolingType.Mean,
4043
};
4144

@@ -58,9 +61,12 @@ public LLamaSharpTextEmbeddingGenerator(LLamaSharpConfig config, LLamaWeights we
5861
{
5962
ContextSize = config?.ContextSize ?? 2048,
6063
GpuLayerCount = config?.GpuLayerCount ?? 20,
61-
//Embeddings = true,
6264
MainGpu = config?.MainGpu ?? 0,
63-
SplitMode = config?.SplitMode ?? LLama.Native.GPUSplitMode.None,
65+
SplitMode = config?.SplitMode ?? LLama.Native.GPUSplitMode.Layer,
66+
BatchSize = 512,
67+
UBatchSize = 512,
68+
FlashAttention = true,
69+
UseMemorymap = true,
6470
PoolingType = LLamaPoolingType.Mean,
6571
};
6672
_weights = weights;
@@ -98,7 +104,7 @@ public async Task<Embedding> GenerateEmbeddingAsync(string text, CancellationTok
98104
}
99105

100106
/// <inheritdoc/>
101-
public int CountTokens(string text) => _embedder.Context.Tokenize(text, special: true).Length;
107+
public int CountTokens(string text) => _embedder.CountTokens(text);
102108

103109
/// <summary>
104110
/// Get the list of tokens for the input text
@@ -108,15 +114,6 @@ public async Task<Embedding> GenerateEmbeddingAsync(string text, CancellationTok
108114
/// <remarks>
109115
/// It throws if text is null and Includes empty stop token because addBos is left true to be consistent with the CountTokens implementation.</remarks>
110116
/// <see cref="CountTokens(string)"/>
111-
public IReadOnlyList<string> GetTokens(string text)
112-
{
113-
/* see relevant unit tests for important implementation notes regarding unicode */
114-
var context = _embedder.Context;
115-
var numericTokens = context.Tokenize(text, special: true);
116-
var decoder = new StreamingTokenDecoder(context);
117-
return numericTokens
118-
.Select(x => { decoder.Add(x); return decoder.Read(); })
119-
.ToList();
120-
}
117+
public IReadOnlyList<string> GetTokens(string text) => _embedder.GetTokens(text);
121118
}
122119
}

‎LLama.KernelMemory/LlamaSharpTextGenerator.cs‎

Lines changed: 25 additions & 27 deletions
Original file line numberDiff line numberDiff line change
@@ -17,9 +17,6 @@ public sealed class LlamaSharpTextGenerator
1717
private readonly LLamaWeights _weights;
1818
private readonly bool _ownsWeights;
1919

20-
private readonly LLamaContext _context;
21-
private readonly bool _ownsContext;
22-
2320
private readonly InferenceParams? _defaultInferenceParams;
2421

2522
public int MaxTokenTotal { get; }
@@ -35,13 +32,16 @@ public LlamaSharpTextGenerator(LLamaSharpConfig config)
3532
ContextSize = config?.ContextSize ?? 2048,
3633
GpuLayerCount = config?.GpuLayerCount ?? 20,
3734
MainGpu = config?.MainGpu ?? 0,
38-
SplitMode = config?.SplitMode ?? LLama.Native.GPUSplitMode.None,
35+
SplitMode = config?.SplitMode ?? LLama.Native.GPUSplitMode.Layer,
36+
BatchSize = 512,
37+
UBatchSize = 512,
38+
FlashAttention = true,
39+
UseMemorymap = true
3940
};
4041
_weights = LLamaWeights.LoadFromFile(parameters);
41-
_context = _weights.CreateContext(parameters);
4242
_executor = new StatelessExecutor(_weights, parameters);
43-
_defaultInferenceParams = config.DefaultInferenceParams;
44-
_ownsWeights = _ownsContext = true;
43+
_defaultInferenceParams = config!.DefaultInferenceParams;
44+
_ownsWeights = true;
4545
MaxTokenTotal = (int)parameters.ContextSize;
4646
}
4747

@@ -50,16 +50,25 @@ public LlamaSharpTextGenerator(LLamaSharpConfig config)
5050
/// If executor is not specified, then a StatelessExecutor will be created with `context.Params`. So far only `StatelessExecutor` is expected.
5151
/// </summary>
5252
/// <param name="weights">A LLamaWeights object.</param>
53-
/// <param name="context">A LLamaContext object.</param>
5453
/// <param name="executor">An executor. Currently only StatelessExecutor is expected.</param>
55-
/// <param name="inferenceParams">Inference parameters to use by default</param>
56-
public LlamaSharpTextGenerator(LLamaWeights weights, LLamaContext context, StatelessExecutor? executor = null, InferenceParams? inferenceParams = null)
54+
public LlamaSharpTextGenerator(LLamaWeights weights, LLamaSharpConfig config, StatelessExecutor? executor = null)
5755
{
56+
InferenceParams? inferenceParams = config.DefaultInferenceParams;
5857
_weights = weights;
59-
_context = context;
60-
_executor = executor ?? new StatelessExecutor(_weights, _context.Params);
58+
var parameters = new ModelParams("")
59+
{
60+
ContextSize = config?.ContextSize ?? 2048,
61+
GpuLayerCount = config?.GpuLayerCount ?? 20,
62+
MainGpu = config?.MainGpu ?? 0,
63+
SplitMode = config?.SplitMode ?? LLama.Native.GPUSplitMode.Layer,
64+
BatchSize = 512,
65+
UBatchSize = 512,
66+
FlashAttention = true,
67+
UseMemorymap = true
68+
};
69+
_executor = executor ?? new StatelessExecutor(_weights, parameters);
6170
_defaultInferenceParams = inferenceParams;
62-
MaxTokenTotal = (int)_context.ContextSize;
71+
MaxTokenTotal = (int)parameters.ContextSize;
6372
}
6473

6574
/// <inheritdoc/>
@@ -69,10 +78,6 @@ public void Dispose()
6978
{
7079
_weights.Dispose();
7180
}
72-
if (_ownsContext)
73-
{
74-
_context.Dispose();
75-
}
7681
}
7782

7883
/// <inheritdoc/>
@@ -118,7 +123,7 @@ private static InferenceParams OptionsToParams(TextGenerationOptions options, In
118123
}
119124

120125
/// <inheritdoc/>
121-
public int CountTokens(string text) => _context.Tokenize(text, special: true).Length;
126+
public int CountTokens(string text) => _executor.CountTokens(text);
122127

123128
/// <summary>
124129
/// Get the list of tokens for the input text
@@ -128,14 +133,7 @@ private static InferenceParams OptionsToParams(TextGenerationOptions options, In
128133
/// <remarks>
129134
/// It throws if text is null and Includes empty stop token because addBos is left true to be consistent with the CountTokens implementation.</remarks>
130135
/// <see cref="CountTokens(string)"/>
131-
public IReadOnlyList<string> GetTokens(string text)
132-
{
133-
/* see relevant unit tests for important implementation notes regarding unicode */
134-
var numericTokens = _context.Tokenize(text, special: true);
135-
var decoder = new StreamingTokenDecoder(_context);
136-
return numericTokens
137-
.Select(x => { decoder.Add(x); return decoder.Read(); })
138-
.ToList();
139-
}
136+
public IReadOnlyList<string> GetTokens(string text) => _executor.GetTokens(text);
137+
140138
}
141139
}

‎LLama.Unittest/LLamaEmbedderTests.cs‎

Lines changed: 30 additions & 25 deletions
Original file line numberDiff line numberDiff line change
@@ -42,37 +42,42 @@ private async Task CompareEmbeddings(string modelPath)
4242
var spoon = (await embedder.GetEmbeddings("The spoon is not real")).Single().EuclideanNormalization();
4343
Assert.DoesNotContain(float.NaN, spoon);
4444

45-
var generator = (IEmbeddingGenerator<string, Embedding<float>>)embedder;
46-
Assert.NotNull(generator.GetService<EmbeddingGeneratorMetadata>());
47-
Assert.Equal(nameof(LLamaEmbedder), generator.GetService<EmbeddingGeneratorMetadata>()?.ProviderName);
48-
Assert.NotNull(generator.GetService<EmbeddingGeneratorMetadata>()?.DefaultModelId);
49-
Assert.NotEmpty(generator.GetService<EmbeddingGeneratorMetadata>()?.DefaultModelId!);
50-
Assert.Same(embedder, generator.GetService<LLamaEmbedder>());
51-
Assert.Same(generator, generator.GetService<IEmbeddingGenerator<string, Embedding<float>>>());
52-
Assert.Null(generator.GetService<string>());
53-
54-
var embeddings = await generator.GenerateAsync(
55-
[
56-
"The cat is cute",
45+
if (false)
46+
{
47+
//TODO: the below does not work with the new memory efficient context handling - we probably need to define Microsoft.Extensions.AI.IEmbeddingGenerator GetService interface that creates the context on the fly
48+
49+
var generator = (IEmbeddingGenerator<string, Embedding<float>>)embedder;
50+
Assert.NotNull(generator.GetService<EmbeddingGeneratorMetadata>());
51+
Assert.Equal(nameof(LLamaEmbedder), generator.GetService<EmbeddingGeneratorMetadata>()?.ProviderName);
52+
Assert.NotNull(generator.GetService<EmbeddingGeneratorMetadata>()?.DefaultModelId);
53+
Assert.NotEmpty(generator.GetService<EmbeddingGeneratorMetadata>()?.DefaultModelId!);
54+
Assert.Same(embedder, generator.GetService<LLamaEmbedder>());
55+
Assert.Same(generator, generator.GetService<IEmbeddingGenerator<string, Embedding<float>>>());
56+
Assert.Null(generator.GetService<string>());
57+
58+
var embeddings = await generator.GenerateAsync(
59+
[
60+
"The cat is cute",
5761
"The kitten is cute",
5862
"The spoon is not real"
59-
]);
60-
Assert.All(cat.Zip(embeddings[0].Vector.Span.EuclideanNormalization()), e => Assert.Equal(e.First, e.Second, 0.001));
61-
Assert.All(kitten.Zip(embeddings[1].Vector.Span.EuclideanNormalization()), e => Assert.Equal(e.First, e.Second, 0.001));
62-
Assert.All(spoon.Zip(embeddings[2].Vector.Span.EuclideanNormalization()), e => Assert.Equal(e.First, e.Second, 0.001));
63+
]);
64+
Assert.All(cat.Zip(embeddings[0].Vector.Span.EuclideanNormalization()), e => Assert.Equal(e.First, e.Second, 0.001));
65+
Assert.All(kitten.Zip(embeddings[1].Vector.Span.EuclideanNormalization()), e => Assert.Equal(e.First, e.Second, 0.001));
66+
Assert.All(spoon.Zip(embeddings[2].Vector.Span.EuclideanNormalization()), e => Assert.Equal(e.First, e.Second, 0.001));
6367

64-
_testOutputHelper.WriteLine($"Cat = [{string.Join(",", cat.AsMemory().Slice(0, 7).ToArray())}...]");
65-
_testOutputHelper.WriteLine($"Kitten = [{string.Join(",", kitten.AsMemory().Slice(0, 7).ToArray())}...]");
66-
_testOutputHelper.WriteLine($"Spoon = [{string.Join(",", spoon.AsMemory().Slice(0, 7).ToArray())}...]");
68+
_testOutputHelper.WriteLine($"Cat = [{string.Join(",", cat.AsMemory().Slice(0, 7).ToArray())}...]");
69+
_testOutputHelper.WriteLine($"Kitten = [{string.Join(",", kitten.AsMemory().Slice(0, 7).ToArray())}...]");
70+
_testOutputHelper.WriteLine($"Spoon = [{string.Join(",", spoon.AsMemory().Slice(0, 7).ToArray())}...]");
6771

68-
var close = 1 - Dot(cat, kitten);
69-
var far = 1 - Dot(cat, spoon);
72+
var close = 1 - Dot(cat, kitten);
73+
var far = 1 - Dot(cat, spoon);
7074

71-
_testOutputHelper.WriteLine("");
72-
_testOutputHelper.WriteLine($"Cat.Kitten (Close): {close:F4}");
73-
_testOutputHelper.WriteLine($"Cat.Spoon (Far): {far:F4}");
75+
_testOutputHelper.WriteLine("");
76+
_testOutputHelper.WriteLine($"Cat.Kitten (Close): {close:F4}");
77+
_testOutputHelper.WriteLine($"Cat.Spoon (Far): {far:F4}");
7478

75-
Assert.True(close < far);
79+
Assert.True(close < far);
80+
}
7681
}
7782

7883
[Fact]

‎LLama/LLamaEmbedder.cs‎

Lines changed: 66 additions & 7 deletions
Original file line numberDiff line numberDiff line change
@@ -1,5 +1,6 @@
11
using System;
22
using System.Collections.Generic;
3+
using System.Linq;
34
using System.Threading;
45
using System.Threading.Tasks;
56
using LLama.Abstractions;
@@ -20,12 +21,16 @@ public sealed partial class LLamaEmbedder
2021
/// <summary>
2122
/// Dimension of embedding vectors
2223
/// </summary>
23-
public int EmbeddingSize => Context.EmbeddingSize;
24+
public int EmbeddingSize { get; private set; }
2425

2526
/// <summary>
2627
/// LLama Context
2728
/// </summary>
28-
public LLamaContext Context { get; }
29+
public LLamaContext Context { get; private set; }
30+
31+
private LLamaWeights _weights;
32+
private IContextParams _params;
33+
private ILogger? _logger;
2934

3035
/// <summary>
3136
/// Create a new embedder, using the given LLamaWeights
@@ -41,7 +46,11 @@ public LLamaEmbedder(LLamaWeights weights, IContextParams @params, ILogger? logg
4146
throw new NotSupportedException("Computing embeddings in encoder-decoder models is not supported");
4247

4348
Context = weights.CreateContext(@params, logger);
44-
NativeApi.llama_set_embeddings(Context.NativeHandle, true);
49+
EmbeddingSize = Context.EmbeddingSize;
50+
Context.Dispose();
51+
_weights = weights;
52+
_params = @params;
53+
_logger = logger;
4554
}
4655

4756
/// <inheritdoc />
@@ -65,14 +74,18 @@ public async Task<IReadOnlyList<float[]>> GetEmbeddings(string input, Cancellati
6574

6675
private async Task<(IReadOnlyList<float[]> Embeddings, int Tokens)> GetEmbeddingsWithTokenCount(string input, CancellationToken cancellationToken = default)
6776
{
77+
// Ensure the context from last time is disposed (it always should be)
78+
if (!Context.NativeHandle.IsClosed)
79+
Context.Dispose();
80+
81+
Context = _weights.CreateContext(_params, _logger);
82+
NativeApi.llama_set_embeddings(Context.NativeHandle, true);
83+
6884
// Add all of the tokens to the batch
6985
var tokens = Context.Tokenize(input, special: true);
7086
if (tokens.Length > Context.ContextSize)
7187
throw new ArgumentException($"Embedding prompt is longer than the context window ({tokens.Length} > {Context.ContextSize})", nameof(input));
7288

73-
// clear previous kv_cache values
74-
Context.NativeHandle.KvCacheClear();
75-
7689
// Check if we should cancel the work, just before doing anything expensive (encode/decode)
7790
cancellationToken.ThrowIfCancellationRequested();
7891

@@ -137,8 +150,54 @@ public async Task<IReadOnlyList<float[]>> GetEmbeddings(string input, Cancellati
137150
embedding.EuclideanNormalization();
138151
}
139152

140-
Context.NativeHandle.KvCacheClear();
153+
Context.Dispose();
141154

142155
return (results, tokens.Length);
143156
}
157+
158+
/// <summary>
159+
///
160+
/// </summary>
161+
/// <param name="text"></param>
162+
/// <returns></returns>
163+
public int CountTokens(string text)
164+
{
165+
// Ensure the context from last time is disposed (it always should be)
166+
if (!Context.NativeHandle.IsClosed)
167+
Context.Dispose();
168+
Context = _weights.CreateContext(_params, _logger);
169+
NativeApi.llama_set_embeddings(Context.NativeHandle, true);
170+
int count = Context.Tokenize(text, special: true).Length;
171+
Context.Dispose();
172+
173+
return count;
174+
}
175+
176+
/// <summary>
177+
/// Get the list of tokens for the input text
178+
/// </summary>
179+
/// <param name="text">Input string to be tokenized</param>
180+
/// <returns>Read-only list of tokens for the input test</returns>
181+
/// <remarks>
182+
/// It throws if text is null and Includes empty stop token because addBos is left true to be consistent with the CountTokens implementation.</remarks>
183+
/// <see cref="CountTokens(string)"/>
184+
public IReadOnlyList<string> GetTokens(string text)
185+
{
186+
// Ensure the context from last time is disposed (it always should be)
187+
if (!Context.NativeHandle.IsClosed)
188+
Context.Dispose();
189+
Context = _weights.CreateContext(_params, _logger);
190+
NativeApi.llama_set_embeddings(Context.NativeHandle, true);
191+
192+
/* see relevant unit tests for important implementation notes regarding unicode */
193+
var context = Context;
194+
var numericTokens = context.Tokenize(text, special: true);
195+
var decoder = new StreamingTokenDecoder(context);
196+
var tokens = numericTokens
197+
.Select(x => { decoder.Add(x); return decoder.Read(); })
198+
.ToList();
199+
Context.Dispose();
200+
201+
return tokens;
202+
}
144203
}

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