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Cosine curve decomposition

In this section, we are going to actually use the TensorFlow.js API to run the FFT program. TensorFlow.js provides several derived implementations for FFT:

tf.spectral.fft
tf.spectral.ifft
tf.spectral.rfft
tf.spectral.irfft

TensorFlow.js also supports short-term Fourier transforms, which are a type of Fourier transformation that takes in a windowed sequence of the original samples:

tf.singal.stft

By showing the output of these APIs with samples from cosine or sine waves, we will learn how this algorithm behaves.

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