Fix trigonometric functions to not raise on f32 inputs

[sasikumar87]

Fixes #1047

[billylanchantin]

Approved pending the precision issues with the tan test.

It looked like they were off by a single decimal place 🙄. Let us know if they persist.

[josevalim]

Precision issues will happen on different machines, OSes and architectures. So one option is to compare that they are within certain delta.

[billylanchantin]

@josevalim Do we have a helper somewhere that acts like Nx.all_close? That'd be handy here.

[josevalim]

We don't but it should be easy to implement. Subtract two series, compute the absolute, see if they are within delta and return true if all true.

[billylanchantin]

Agreed. It'd be generally helpful too.

pi = :math.pi()
radians_list = [-2 * pi, -pi, -pi / 2, 0, pi / 2, pi, 2 * pi]
degrees_list = [-360.0, -180.0, -90.0, 0.0, 90.0, 180.0, 360.0]

radians = Series.from_list(radians_list, dtype: :f32)
degrees = Series.from_list(degrees_list, dtype: :f32)

result = Series.degrees(radians)
assert all_close?(result, degrees)
assert Series.dtype(result) == {:f, 64}

# ...

defp all_close?(%Series{} = a, %Series{} = b, tol \\ 1.0e-8) do
  Series.subtract(a, b)
  |> Series.abs()
  |> Series.less_equal(tol)
  |> Series.all?()
end

[sasikumar87]

@billylanchantin fixed the test.

[billylanchantin]

Thanks, @sasikumar87!