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Failed to fetch

https://github.com/Startup-Data/SatLunNeh/blob/master/AI%20Parts/Music%20Part/ddsp/ddsp/colab/demos/timbre_transfer.ipynb 
Failed to fetch
TypeError: Failed to fetch
    at wa.program_ (https://ssl.gstatic.com/colaboratory-static/common/34e60ea413ae0ca2b8ccf52cad6cb7bc/external_binary.js:2443:272)
    at za (https://ssl.gstatic.com/colaboratory-static/common/34e60ea413ae0ca2b8ccf52cad6cb7bc/external_binary.js:16:57)
    at wa.next_ (https://ssl.gstatic.com/colaboratory-static/common/34e60ea413ae0ca2b8ccf52cad6cb7bc/external_binary.js:14:195)
    at kaa.next (https://ssl.gstatic.com/colaboratory-static/common/34e60ea413ae0ca2b8ccf52cad6cb7bc/external_binary.js:17:48)
    at https://ssl.gstatic.com/colaboratory-static/common/34e60ea413ae0ca2b8ccf52cad6cb7bc/external_binary.js:17:463
    at new Promise (<anonymous>)
    at laa (https://ssl.gstatic.com/colaboratory-static/common/34e60ea413ae0ca2b8ccf52cad6cb7bc/external_binary.js:17:356)
    at y (https://ssl.gstatic.com/colaboratory-static/common/34e60ea413ae0ca2b8ccf52cad6cb7bc/external_binary.js:18:22)
    at Q_a (https://ssl.gstatic.com/colaboratory-static/common/34e60ea413ae0ca2b8ccf52cad6cb7bc/external_binary.js:2443:50)
    at wa.program_ (https://ssl.gstatic.com/colaboratory-static/common/34e60ea413ae0ca2b8ccf52cad6cb7bc/external_binary.js:2445:408)
 OK