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good intermediate version.  rand_uniform has no output_lens, but passes ref_ops_tests and onnx tests.  parse_randomuniform_ops not updated.

Updated each source file in the repo with the existing license.

Fix bug caused by casting time seed to float

Add multinomial op to onnx parser with ref and GPU implementations.

The onnx parser inserts a literal of shape {batch_size, sample_size} with random values in the range [0, 1) and inserts existing ops to compute the cumulative density function. The multinomial operator multiplies the random values by the sum of the CDF and returns the index of the first element of the CDF that is greater than the result, representing samples randomly drawn from [0, class_size) that follow the log-probability distribution.

Resolves #821
Co-authored-by: Shucai Xiao <shucai@gmail.com>