Arraymancer

A tensor (N-dimensional array) project. Focus on machine learning, deep learning and numerical computing.

A tensor supports arbitrary types (floats, strings, objects ...).

EXPERIMENTAL: API may change and break.

Goals

The automatic backpropagation library Nim-RMAD needs to be generalized to vectors and matrices, 3D, 4D, 5D tensors for deep learning.

Unfortunately, attempts to use linalg's vector and matrix types were unsuccessful. Support for 3D+ tensors would also need more work.

This library aims to provided an efficient tensor/ndarray type. Focus will be on numerical computation (BLAS) and GPU support. The library will be flexible enough to represent arbitrary N-dimensional Arrays, especially for NLP word vectors.

Current status

EXPERIMENTAL: Arraymancer may summon Ragnarok and cause the heat death of the Universe.

Arraymancer's tensors currently support the following:

• Wrapping any type: string, floats, object

• Getting and setting value at a specific index (Caveat: negative indices support needs work)

• Creating a tensor from deep nested sequences

• Universal functions from Nim math module: cos, ln, sqrt... will work element-wise

• Creating your own universal functions with makeUniversal, makeUniversalLocal and fmap.

  fmap can even be used on functions with input/ouput of different types.

• Optimized Linear Algebra through BLAS (via nimblas)

  For now only Matrix to Matrix multiplication is available, multiplication and addition for Vector-Vector, Matrix-Vector and Matrix-Matrix are coming very soon.

Check syntax examples in the test folder.

Not prioritized

The following Numpy-like functionality:

• slicing,
• iterating,
• assigning,
• statistics (mean, median, stddev ...)

will be added on an as-needed basis.