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# ================================= tips ===================================
#    In PyTorch's GRU, "no h_0 argument" == `h_0=None` == "h_0 is zeros" 
# ==========================================================================

from torch.nn import GRU
from torch import tensor

gru = GRU(3, 3, batch_first=True)
i = tensor([[[1., 2., 3.]]])
h = tensor([[[0., 0., 0.]]])

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# Audio Preemphasis/Deemphasis in Notebook.
# You can hear the audio see spectrograms.

!pip install librosa>=0.8.1

import IPython
from IPython.display import display, Audio
import numpy as np
import librosa
import librosa.display

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import u3
d = u3.U3() # try automatic open
d.configIO(FIOAnalog = 0, EIOAnalog = 0) # set all fio digital # https://github.com/labjack/LabJackPython/blob/1399afafef4e29d7081e223b0ecac98d7bdd67a4/src/u3.py#L336


def send3bit(fio_No: int, bits: [int]):
    """Send 3-bit big endian message
    Arguments:
        fio_No -- LabJack U3's flexible IO port number. e.g: [0,0,1] (==1)
        bits   -- message with 3-bit big endian

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