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.. meta::
:description: MIOpen API datatypes
:keywords: MIOpen, ROCm, API, documentation, datatypes
********************************************************************
Datatypes
********************************************************************
MIOpen contains several datatypes at different levels of support. The enumerated datatypes are:
.. code:: cpp
typedef enum {
miopenHalf = 0,
miopenFloat = 1,
miopenInt32 = 2,
miopenInt8 = 3,
/* Value 4 is reserved. */
miopenBFloat16 = 5,
miopenDouble = 6,
miopenFloat8 = 7,
miopenBFloat8 = 8
} miopenDataType_t;
Of these types only ``miopenFloat`` and ``miopenHalf`` are fully supported across all layers in MIOpen.
Refer to the individual :doc:`Modules <../doxygen/html/modules>` in the API library for specific
datatype support and limitations.
Type descriptions:
* ``miopenHalf``: 16-bit floating point
* ``miopenFloat``: 32-bit floating point
* ``miopenInt32``: 32-bit integer, used primarily for ``int8`` convolution outputs
* ``miopenInt8``: 8-bit integer; supported by ``int8`` convolution forward path, tensor set, tensor copy, tensor cast, tensor transform, tensor transpose, and im2col
* ``miopenBFloat16``: brain float fp-16 (8-bit exponent, 7-bit fraction); supported by convolutions, tensor set, and tensor copy
* ``miopenDouble``: 64-bit floating point; supported by reduction, layerNorm, and batchNorm
* ``miopenFloat8``: 8-bit floating point (layout 1.4.3, exponent bias 7); supported by convolutions
* ``miopenBFloat8``: 8-bit floating point (layout 1.5.2, exponent bias 15); supported by convolutions
In addition to these standard datatypes, pooling also contains its own indexing datatypes:
.. code:: cpp
typedef enum {
miopenIndexUint8 = 0,
miopenIndexUint16 = 1,
miopenIndexUint32 = 2,
miopenIndexUint64 = 3,
} miopenIndexType_t;
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