July 2017
Beginner to intermediate
715 pages
17h 3m
English
Content preview from Java: Data Science Made Easy
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Using the ND4J API
ND4J (http://nd4j.org/) is the library used by DL4J to perform arithmetic operations. The library is also available for direct use. In this section, we will demonstrate how matrix multiplication is performed using the A and B matrices.
Before we can perform the multiplication, we need to flatten the matrices to vectors. The following declares and initializes these vectors:
double[] A = { 0.1950, 0.0311, 0.3588, 0.2203, 0.1716, 0.5931, 0.2105, 0.3242}; double[] B = { 0.0502, 0.9823, 0.9472, 0.5732, 0.2694, 0.916};
The Nd4j class' create method creates an INDArray instance given a vector and dimension information. The first argument of the method is the vector. The second argument specifies the dimensions of the matrix. ...