Commits on Jan 19, 2019

1. Julia: deprecate mx.empty, replace it with UndefInitializer …

   In Julia 0.7+, constructing a uninitialized array is provided via
   the APIs:
           - `Array{T,N}(undef, dims...)`
           - `Array{T,N}(undef, dims)`
           - `Array{T}(undef,   dims...)`
           - `Array{T}(undef,   dims)`
   
   There is an API `mx.empty(dims...)` serving for this purpose.
   
   This PR proposes that deprecating the original API `mx.empty` and
   provide the functionality with the API design similar to Julia's Base.
   
           - `NDArray{T,N}(undef, dims...)`
           - `NDArray{T,N}(undef, dims)`
           - `NDArray{T}(undef,   dims...)`
           - `NDArray{T}(undef,   dims)`
           - `NDArray(undef,      dims...)`
           - `NDArray(undef,      dims)`
   
   e.g.
   
   ```julia
   julia> NDArray{Int,2}(undef, 5, 2)
   5×2 NDArray{Int64,2} @ CPU0:
    94290755905104  94290752678143
    94290752660544     68719476760
    94290752674408  94290737734368
    94290752660544              18
    94290752674408              18
   
   julia> NDArray(undef, 5, 2)  # default type is `mx.MX_float`
   5×2 NDArray{Float32,2} @ CPU0:
    -29112.406f0       5.2029858f-8
         3.0763f-41    6.7375383f-10
         1.7613131f19  0.0f0
         4.840456f30   0.0f0
         4.4262863f30  0.0f0
   ```
   
   - The original `mx.empty` APIs are still functional.
     If user invokes them, a deprecation warning will be popped up.

   

   iblislin committed Jan 19, 2019
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