Default arguments do not work with only 1 argument

[seanmor5]

As an example, this does not compile:

  defn uniform(opts \\ []) do
    shape = transform(opts, &Keyword.fetch!(&1, :shape))
    opts = keyword!(opts, type: {:f, 32}, shape: {}, scale: 1.0e-2)
    Nx.random_uniform(shape, type: opts[:type]) * opts[:scale]
  end

But this does:

  defn uniform(_t, opts \\ []) do
    shape = transform(opts, &Keyword.fetch!(&1, :shape))
    opts = keyword!(opts, type: {:f, 32}, shape: {}, scale: 1.0e-2)
    Nx.random_uniform(shape, type: opts[:type]) * opts[:scale]
  end

Even though t is unused.

[josevalim]

Nice catch, I will fix it soon.

Btw, if you want to validate a key but not give it a default value., you can write it like this:

opts = keyword!(opts, [:shape, type: {:f, 32}, scale: 1.0e-2])

But the current way is fine given you assert for the shape first.