Community Blog How to Classify Images Using Tensorflow

How to Classify Images Using Tensorflow

The processing of unstructured image data involves the use of deep learning algorithms, in this article you will find an efficient solution with Tensorflow.

As one of the hottest subtopics of artificial intelligence, deep learning can be applied in many fields, like image recognition. But how to make use of unstructured data from large amounts of image data?

The processing of unstructured data usually involves the use of deep learning algorithms and these algorithms can be daunting for beginners. In addition, processing unstructured data usually requires powerful GPUs and a large amount of computing resources. This article introduces a method of image recognition using deep learning. This method can be applied to scenarios such as illicit image filtering, and object detection.

The experiment of creating an image recognition model using the deep learning framework TensorFlow in Alibaba Cloud Machine Learning Platform for AI may take about 30 minutes.

  1. Download the dataset and source code: Tensorflow_cifar10 case and decompress them.
  2. Prepare data. In this experiment we will use OSS, so Create new directory in OSS bucket with four folders: check_point for model storage, cifar-10-batches-py for training data storage, predict_code and train_code. And then upload the dataset and source data to the corresponding directory of the OSS bucket.
  3. Configure OSS permissions.
  4. Train the model with Tensorflow.
  5. View the logs generated during the training process by right-clicking the TensorFlow component.
  6. Drag another TensorFlow component for use in predicting.

For detailed information, please go to Image Classification with TensorFlow.

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What's Behind Alibaba Cloud's Record-Breaking Image Recognition Performance?

On December 25, 2018, Stanford University released the latest DAWNBench deep learning inference rankings. Alibaba Cloud ranked first in terms of image recognition performance and cost.

To achieve the fastest performance and lowest cost, the participating team made optimizations in the following three aspects: deep learning model selection, 8-bit quantitative optimization, and Alibaba Cloud GPU instance selection.

The Alibaba Cloud team selects the popular TensorFlow deep learning framework for optimization, so that Alibaba Cloud customers can have access to the optimization results. Int8 quantization is based on TensorRT. The difficulty of optimization lies in quantizing the well-trained TensorFlow model into the TensorRT Int8 model and loading the quantized TensorRT model to the TensorFlow computing diagram for inference.

The team then performed deep optimization based on the benchmark code of TensorFlow. The Kullback-Leibler divergence before and after quantization is calculated during Int8 quantization to calibrate the dynamic range of activated values at each layer of the neural network. The Alibaba Cloud team completes calibration in three phases: (1) create an Int8 quantization model; (2) calibrate the quantization model; (3) generate the optimized Int8 model based on the calibration results. The team then optimized the benchmark inference mode to import the optimized inference engine.

My Thoughts on Distributed Computing Frameworks

This article provides a fully verified solution (with code) to run LR and GBDT on a LibSVM-formatted dataset efficiently using TensorFlow.

MapReduce, Spark, and TensorFlow all utilize distributed computing capabilities to perform some calculations and solve specific problems. From this perspective, they all define a distributed computing model, that is, they put forward a computing method that enables the distributed computing of large amounts of data. However, MapReduce, Spark, and TensorFlow differ in the distributed computing model put forward. MapReduce, as its name implies, is a basic map-reduce computing model. Spark defines a set of RDD models, which are essentially a DAG consisting of maps/reduces. The TensorFlow computing model is also a graph, which is more complex than that of Spark. You need to define each node and edge in the TensorFlow graph. These definitions can be used to specify how TensorFlow computes this graph. Acting as a TensorFlow neural network, these specific definitions make TensorFlow suitable for processing a specific type of computations. The RDD model of Spark makes RDD suitable for processing non-correlated parallel data tasks. Is it possible to implement a general-purpose, simple, and high-performance distributed computing model? In my opinion, it is very difficult to implement this kind of computing model. The "general-purpose" feature usually means that the performance cannot be optimized based on specific circumstances. However, a distributed framework written for specific tasks is neither general-purpose nor simple.

Related Documentation

Use TensorFlow Serving

TensorFlow Serving uses Alibaba Cloud elastic computing resources (Elastic Compute Service (ECS) or EGS), Server Load Balancer, and Object Storage Service (OSS) to perform prediction for TensorFlow models.

Implement image classification by TensorFlow

This guide creates an image recognition model using the deep learning framework TensorFlow in Alibaba Cloud Machine Learning Platform for AI. The entire procedure takes about 30 minutes to complete. After the procedure, the system is able to recognize the bird in the following image.

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