@AsakusaRinne in this project nullable is enabled by default. I can change if needed.

@AsakusaRinne I can convert it to fsproj if needed to force users use F# in tests. However, I think it doesn't make sense for a class.

@AsakusaRinne how to get value of Ndarray if an Ndarray is a scalar?

@AsakusaRinne how to get value of Ndarray if an Ndarray is a scalar?

You can just use int a = nd; for implication converting.

  Error Message:
   Test method TensorFlowNET.UnitTest.Gradient.GradientTest.testDependentYs threw exception: 
System.NotImplementedException: 
  Stack Trace:
      at Tensorflow.NumPy.np.allclose(NDArray a, NDArray b, Double rtol, Double atol, Boolean equal_nan) in /home/runner/work/TensorFlow.NET/TensorFlow.NET/src/TensorFlowNET.Core/Numpy/Numpy.cs:line 69
   at TensorFlowNET.UnitTest.PythonTest.assertAllClose(Double value, NDArray array2, Double eps) in /home/runner/work/TensorFlow.NET/TensorFlow.NET/test/Tensorflow.UnitTest/PythonTest.cs:line 142
   at TensorFlowNET.UnitTest.Gradient.GradientTest.testDependentYs() in /home/runner/work/TensorFlow.NET/TensorFlow.NET/test/TensorFlowNET.Graph.UnitTest/GradientTest/GradientTest.cs:line 600

Yes, one of the tests wasn't fully enabled before (in one of my previous PRs). Now the assertion works correctly and the error above is fixed.

@AsakusaRinne how to get value of Ndarray if an Ndarray is a scalar?

You can just use int a = nd; for implication converting.

Thank you! I was confused by the fact that .ToArray() doesn't work properly on a scalar. May be this is correct behaviour and it should throw exceptions.