Python's numpy has adopted faulty nomenclature.

In numpy, ravel() decomposes a multidimensional array
into a one-dimensional array.  Good choice of name.

But, in numpy, unravel_index() recovers the higher dimensional
structure of a one-dimensional array. Useful function! but bad 
choice of name, since in the English language, "unravel" means 
the same as "ravel." Also, it yields indices (plural) not one index.
So, this nomenclature should be useless, returning the given index.

Recovering the higher dimensional indices should be named

      getWeaveIndices(index1D, desired.shape) 
or 
      getReshapedIndices(index1D, desired.shape)
not
      unravel_index(index1D, desired.shape)

-------from https://www.merriam-webster.com/dictionary/ravel----------

ravel:  TRANSITIVE VERB
a. to separate or undo the texture of: see "unravel"
b. to undo the intracies of: see "disentangle"

ravel: INTRANSITIVE VERB
a. to become unwoven, untwisted, unwound: see "fray"

unravel: TRANSITIVE VERB
a. to disengage or separate the threads of: see "disentangle"

weave: TRANSITIVE VERB
a. to form (cloth) by interlacing strands (as of yarn)
b: to direct something in a winding or zigzag course