最开始我讲过了，如何对倒数函数求导。
What I showed you at the beginning, and then erased, basically justifies how to take the derivative of a reciprocal function.
在几个维护检查之后，倒数第二个步骤是调用模块的exit函数(模块内部自带)。
After a few more housekeeping checks, the penultimate step is to call the module's exit function (provided within the module itself).
当网络连接权值矩阵的最小特征值大于激活函数导数的倒数时，网络并行收敛。
When the minimal eigenvalue of connection weights matrix is greater than the reciprocal of derivation of its neuron activation function, the network will be convergent in parallel update mode.
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