Python wrapper for arrayfire 3.4

• Feature parity with ArrayFire 3.4 libs
  • Sparse matrix support
    • create_sparse
    • create_sparse_from_dense
    • create_sparse_from_host
    • convert_sparse_to_dense
    • convert_sparse
    • sparse_get_info
    • sparse_get_nnz
    • sparse_get_values
    • sparse_get_row_idx
    • sparse_get_col_idx
    • sparse_get_storage
  • Random Engine support
    • Three new random engines, RANDOM_ENGINE.PHILOX, RANDOM_ENGINE.THREEFRY, and RANDOM_ENGINE.MERSENNE.
    • randu and randn now accept an additional engine parameter.
    • set_default_random_engine_type
    • get_default_random_engine
  • New functions
    • scan
    • scan_by_key
    • clamp
    • medfilt1
    • medfilt2
    • moments
    • get_size_of
    • get_manual_eval_flag
    • set_manual_eval_flag
  • Behavior changes
    • eval now supports fusing kernels.
  • Graphics updates
    • plot updated to take new parameters.
    • plot2 added.
    • scatter updated to take new parameters.
    • scatter2 added.
    • vector_field added.
    • set_axes_limits added.
• Bug fixes
  • ArrayFire now has higher priority when numpy for mixed operations. ^{1 2}
  • Numpy interoperability issues on Widnows. ¹
  • Switch to a working backend by default. ¹
  • Fixed incorrect behavior for Hermitian transpose and QR. ¹
  • array[0:0] now returns empty arrays. ¹
• Further Improvements from upstream can be read in the arrayfire release notes.