# mx.nd.ravel.multi.index¶

## Description¶

Converts a batch of index arrays into an array of flat indices. The operator follows numpy conventions so a single multi index is given by a column of the input matrix. The leading dimension may be left unspecified by using -1 as placeholder.

Example:

A = [[3,6,6],[4,5,1]]
ravel(A, shape=(7,6)) = [22,41,37]
ravel(A, shape=(-1,6)) = [22,41,37]


## Arguments¶

Argument

Description

data

NDArray-or-Symbol.

Batch of multi-indices

shape

Shape(tuple), optional, default=None.

Shape of the array into which the multi-indices apply.

## Value¶

out The result mx.ndarray