using System; using System.Collections.Generic; using Unity.MLAgents.Inference.Utils; using Unity.Barracuda; namespace Unity.MLAgents.Inference { /// /// Tensor - A class to encapsulate a Tensor used for inference. /// /// This class contains the Array that holds the data array, the shapes, type and the /// placeholder in the execution graph. All the fields are editable in the inspector, /// allowing the user to specify everything but the data in a graphical way. /// [Serializable] internal class TensorProxy { public enum TensorType { Integer, FloatingPoint }; static readonly Dictionary k_TypeMap = new Dictionary() { {TensorType.FloatingPoint, typeof(float)}, {TensorType.Integer, typeof(int)} }; public string name; public TensorType valueType; // Since Type is not serializable, we use the DisplayType for the Inspector public Type DataType => k_TypeMap[valueType]; public long[] shape; public Tensor data; public long Height { get { return shape.Length == 4 ? shape[1] : shape[5]; } } public long Width { get { return shape.Length == 4 ? shape[2] : shape[6]; } } public long Channels { get { return shape.Length == 4 ? shape[3] : shape[7]; } } } internal static class TensorUtils { public static void ResizeTensor(TensorProxy tensor, int batch, ITensorAllocator allocator) { if (tensor.shape[0] == batch && tensor.data != null && tensor.data.batch == batch) { return; } tensor.data?.Dispose(); tensor.shape[0] = batch; if (tensor.shape.Length == 4 || tensor.shape.Length == 8) { tensor.data = allocator.Alloc( new TensorShape( batch, (int)tensor.Height, (int)tensor.Width, (int)tensor.Channels)); } else { tensor.data = allocator.Alloc( new TensorShape( batch, (int)tensor.shape[tensor.shape.Length - 1])); } } internal static long[] TensorShapeFromBarracuda(TensorShape src) { if (src.height == 1 && src.width == 1) { return new long[] { src.batch, src.channels }; } return new long[] { src.batch, src.height, src.width, src.channels }; } public static TensorProxy TensorProxyFromBarracuda(Tensor src, string nameOverride = null) { var shape = TensorShapeFromBarracuda(src.shape); return new TensorProxy { name = nameOverride ?? src.name, valueType = TensorProxy.TensorType.FloatingPoint, shape = shape, data = src }; } /// /// Fill a specific batch of a TensorProxy with a given value /// /// /// The batch index to fill. /// public static void FillTensorBatch(TensorProxy tensorProxy, int batch, float fillValue) { var height = tensorProxy.data.height; var width = tensorProxy.data.width; var channels = tensorProxy.data.channels; for (var h = 0; h < height; h++) { for (var w = 0; w < width; w++) { for (var c = 0; c < channels; c++) { tensorProxy.data[batch, h, w, c] = fillValue; } } } } /// /// Fill a pre-allocated Tensor with random numbers /// /// The pre-allocated Tensor to fill /// RandomNormal object used to populate tensor /// /// Throws when trying to fill a Tensor of type other than float /// /// /// Throws when the Tensor is not allocated /// public static void FillTensorWithRandomNormal( TensorProxy tensorProxy, RandomNormal randomNormal) { if (tensorProxy.DataType != typeof(float)) { throw new NotImplementedException("Only float data types are currently supported"); } if (tensorProxy.data == null) { throw new ArgumentNullException(); } for (var i = 0; i < tensorProxy.data.length; i++) { tensorProxy.data[i] = (float)randomNormal.NextDouble(); } } } }