Update nbeats/sub_modules.py to remove UserWarning #1580
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Issue
This PR removes a warning raised by nbeats/sub_module.py:
UserWarning: Creating a tensor from a list of numpy.ndarrays is extremely slow. Please consider converting the list to a single numpy.ndarray with numpy.array() before converting to a tensor.
This commit replaces the relevant sections with the appropriate code to remove the warning in nbeats submodule. (similar to #754)
Proposed change:
Change the implementation, as suggested by the warning to increase efficiency.