(2) TensorFlow编程模型的介绍不够系统（第1章）。后续具体机器学习算法如何映射到TensorFlow计算图（computation graph），存在一个断层。
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A Computation Graph and Optimizations 计算图和优化
Dynamic Computation Graph 动态计算图
computation graph of Petri net Petri网计算图
Derivatives with a Computation Graph 计算图导数
Graph Computation 图谱计算
The computation is structured as a directed graph: programs are graph vertices, while the channels are graph edges.
计算是结构化的，以有向图的方式进行：程序是图形顶点，而通道则作为图的边。
The preprocessing in an automatic fingerprint identification system usually includes five steps: normalization, directional graph computation, image segmentation, filtering and binarization.
指纹预处理一般包括规格化、方向图计算、图像分割、滤波、二值化等环节，该文系统地讨论了各环节的有效算法。
The method of face detection is establishment of skin color model and computation of similarity graph, then classify by threshold segmentation.
脸部位置的检测定位主要建立肤色模型以及计算肤色相似度图，通过阈值分割方法进行分类和定位。
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