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+---
+tags:
+  - golang
+  - go-weekly
+authors:
+  - fuatto
+title: 'Go Commentary #22: GoMLX: ML in Go without Python'
+short_title: '#22 GoMLX: ML in Go without Python'
+description: Running Machine Learning inference in Go without Python
+date: 2024-11-29
+---
+
+## [GoMLX: ML in Go without Python](https://eli.thegreenplace.net/2024/gomlx-ml-in-go-without-python)
+
+### How ML models are implemented
+
+- Written in Python, using frameworks like TensorFlow, JAX or Pytorch that take care of:
+
+  - Expressive way to describe the model architecture, including auto-differentiation for training.
+  - Efficient implementation of computational primitives on common HW: CPUs, GPUs and TPUs.
+
+![](assets/openxla-diagram-with-gopher.png)
+
+- The frameworks that provide high-level primitives to define and translate ML models to a common interchange format called StableHLO (High-Level Operations).
+
+- The OpenXLA system, which includes two major components: the XLA compiler translating HLO to HW machine code, and PJRT - the runtime component responsible for managing HW devices, moving data (tensors) between the host CPU and these devices, executing tasks, sharding and so on.
+
+- HW that executes these models efficiently. (C/C++ hidden complexity)
+
+### GoMLX
+
+- Wraps XLA - access to all building blocks TF and JAX use
+
+### Examples
+
+- a CNN (convolutional neural network) without any Python, training it on [CIFAR-10](https://www.cs.toronto.edu/~kriz/cifar.html)
+
+as expected, Go code is longer and more explicit
+```go
+// define the model graph
+func C10ConvModel(mlxctx *mlxcontext.Context, spec any, inputs []*graph.Node) []*graph.Node {
+  batchedImages := inputs[0]
+  g := batchedImages.Graph()
+  dtype := batchedImages.DType()
+  batchSize := batchedImages.Shape().Dimensions[0]
+  logits := batchedImages
+
+  layerIdx := 0
+  nextCtx := func(name string) *mlxcontext.Context {
+    newCtx := mlxctx.Inf("%03d_%s", layerIdx, name)
+    layerIdx++
+    return newCtx
+  }
+
+  // Convolution / activation layers
+  logits = layers.Convolution(nextCtx("conv"), logits).Filters(32).KernelSize(3).PadSame().Done()
+  logits.AssertDims(batchSize, 32, 32, 32)
+  logits = activations.Relu(logits)
+  logits = layers.Convolution(nextCtx("conv"), logits).Filters(32).KernelSize(3).PadSame().Done()
+  logits = activations.Relu(logits)
+  logits = graph.MaxPool(logits).Window(2).Done()
+  logits = layers.DropoutNormalize(nextCtx("dropout"), logits, graph.Scalar(g, dtype, 0.3), true)
+  logits.AssertDims(batchSize, 16, 16, 32)
+
+  logits = layers.Convolution(nextCtx("conv"), logits).Filters(64).KernelSize(3).PadSame().Done()
+  logits.AssertDims(batchSize, 16, 16, 64)
+  logits = activations.Relu(logits)
+  logits = layers.Convolution(nextCtx("conv"), logits).Filters(64).KernelSize(3).PadSame().Done()
+  logits.AssertDims(batchSize, 16, 16, 64)
+  logits = activations.Relu(logits)
+  logits = graph.MaxPool(logits).Window(2).Done()
+  logits = layers.DropoutNormalize(nextCtx("dropout"), logits, graph.Scalar(g, dtype, 0.5), true)
+  logits.AssertDims(batchSize, 8, 8, 64)
+
+  logits = layers.Convolution(nextCtx("conv"), logits).Filters(128).KernelSize(3).PadSame().Done()
+  logits.AssertDims(batchSize, 8, 8, 128)
+  logits = activations.Relu(logits)
+  logits = layers.Convolution(nextCtx("conv"), logits).Filters(128).KernelSize(3).PadSame().Done()
+  logits.AssertDims(batchSize, 8, 8, 128)
+  logits = activations.Relu(logits)
+  logits = graph.MaxPool(logits).Window(2).Done()
+  logits = layers.DropoutNormalize(nextCtx("dropout"), logits, graph.Scalar(g, dtype, 0.5), true)
+  logits.AssertDims(batchSize, 4, 4, 128)
+
+  // Flatten logits, and apply dense layer
+  logits = graph.Reshape(logits, batchSize, -1)
+  logits = layers.Dense(nextCtx("dense"), logits, true, 128)
+  logits = activations.Relu(logits)
+  logits = layers.DropoutNormalize(nextCtx("dropout"), logits, graph.Scalar(g, dtype, 0.5), true)
+  numClasses := 10
+  logits = layers.Dense(nextCtx("dense"), logits, true, numClasses)
+  return []*graph.Node{logits}
+}
+```
+
+```go
+// the classifier
+func main() {
+  flagCheckpoint := flag.String("checkpoint", "", "Directory to load checkpoint from")
+  flag.Parse()
+
+  mlxctx := mlxcontext.New()
+  backend := backends.New()
+
+  _, err := checkpoints.Load(mlxctx).Dir(*flagCheckpoint).Done()
+  if err != nil {
+    panic(err)
+  }
+  mlxctx = mlxctx.Reuse() // helps sanity check the loaded context
+  exec := mlxcontext.NewExec(backend, mlxctx.In("model"), func(mlxctx *mlxcontext.Context, image *graph.Node) *graph.Node {
+    // Convert our image to a tensor with batch dimension of size 1, and pass
+    // it to the C10ConvModel graph.
+    image = graph.ExpandAxes(image, 0) // Create a batch dimension of size 1.
+    logits := cnnmodel.C10ConvModel(mlxctx, nil, []*graph.Node{image})[0]
+    // Take the class with highest logit value, then remove the batch dimension.
+    choice := graph.ArgMax(logits, -1, dtypes.Int32)
+    return graph.Reshape(choice)
+  })
+
+  // classify takes a 32x32 image and returns a Cifar-10 classification according
+  // to the models. Use C10Labels to convert the returned class to a string
+  // name. The returned class is from 0 to 9.
+  classify := func(img image.Image) int32 {
+    input := images.ToTensor(dtypes.Float32).Single(img)
+    outputs := exec.Call(input)
+    classID := tensors.ToScalar[int32](outputs[0])
+    return classID
+  }
+
+  // ...
+}
+```
+
+- [a Gemma2 from Kaggle](https://www.kaggle.com/models/google/gemma-2) example
+
+```go
+var (
+  flagDataDir   = flag.String("data", "", "dir with converted weights")
+  flagVocabFile = flag.String("vocab", "", "tokenizer vocabulary file")
+)
+
+func main() {
+  flag.Parse()
+  ctx := context.New()
+
+  // Load model weights from the checkpoint downloaded from Kaggle.
+  err := kaggle.ReadConvertedWeights(ctx, *flagDataDir)
+  if err != nil {
+    log.Fatal(err)
+  }
+
+  // Load tokenizer vocabulary.
+  vocab, err := sentencepiece.NewFromPath(*flagVocabFile)
+  if err != nil {
+    log.Fatal(err)
+  }
+
+  // Create a Gemma sampler and start sampling tokens.
+  sampler, err := samplers.New(backends.New(), ctx, vocab, 256)
+  if err != nil {
+    log.Fatalf("%+v", err)
+  }
+
+  start := time.Now()
+  output, err := sampler.Sample([]string{
+    "Are bees and wasps similar?",
+  })
+  if err != nil {
+    log.Fatalf("%+v", err)
+  }
+  fmt.Printf("\tElapsed time: %s\n", time.Since(start))
+  fmt.Printf("Generated text:\n%s\n", strings.Join(output, "\n\n"))
+}
+```
+
+### Conclusion
+
+- Using GoMLX can help implement ML inference in Go without Python
+
+- Since it's a relatively new project, it may be a little risky for production uses for now.
+
+---
+
+https://eli.thegreenplace.net/2024/gomlx-ml-in-go-without-python
+
+https://www.cs.toronto.edu/~kriz/cifar.html
+
+https://www.kaggle.com/models/google/gemma-2
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