Facebook开源Torchnet加速深度学习，Caffe 、TensorFlow将可用

Facebook宣布开源用于简化深度学习的软件Torchnet。

• 用Lua编写
• 支持代码重用，减少出bug概率
• 简化异步、并行数据loading，提升多GPU效率
• 可能不会一直局限于Torch，其抽象将有Caffe、TensorFlow实现
• 方法有点类似于Theano框架的Blocks和Fuel库
• 已经应用于Facebook图像识别和NLP

Facebook工程师Laurens van der Maaten表示，Torchnet的核心不是让Torch更快（而是简化深度学习工作），举例而言它可以减少IO开销，这对大型神经网络尤其重要。

The goal of open-sourcing Torchnet is to empower the developer community, allowing it to rapidly build effective and reusable learning systems.

与Caffe、Chainer、TensorFlow和Theano等深度学习框架的一个很大的不同，是不注重深层网络中高效率的推理和梯度计算，Torchnet提供一个深度学习框架之上的框架（如torch/nn），使得rapid experimentation更容易。

Torchnet provides a collection of subpackages and implements five main types of abstractions:

• Datasets — provide a size function that returns the number of samples in the data set, and a get(idx) function that returns the idx-th sample in the data set.
• Dataset Iterators — a simple for loop that runs from one to the data set size and calls the get() function with loop value as input.
• Engines — provides the boilerplate logic necessary for training and testing models.

• Meter — used for performance measurements, such as the time needed to perform a training epoch or the value of the loss function averaged over all examples.

• Logs — for logging experiments.

The most important subpackages provide implementations of boilerplate code that is relevant to machine-learning problems. These include computer vision, natural language processing, and speech processing.

相关资源：

• Github：https://github.com/torchnet/torchnet
• 官方博客：Lighting the way to deep machine learning
• ICML论文：Torchnet: An Open-Source Platform for (Deep) Learning Research