Cast (float to half/int32_t)

Atlas 350 Accelerator Card

√

Atlas A3 training product/Atlas A3 inference product

√

Atlas A2 training product/Atlas A2 inference product

√

Atlas 200I/500 A2 inference product

x

Atlas inference product AI Core

√

Atlas inference product Vector Core

x

Atlas training product

x

T

Data type of valueIn. The value can be float.

U

Data type after conversion. The value can be half or int32_t.

roundMode

Precision conversion mode. The type is RoundMode.

RoundMode is of the enum class and is used to control the precision conversion mode. The definition is as follows:

1
2
3
4
5
6
7
8
9

enum class RoundMode {
    CAST_NONE = 0,  // If precision loss is involved during conversion, the CAST_RINT mode is used. If precision loss is not involved, the value is not rounded.
    CAST_RINT,      // rint, banker's rounding
    CAST_FLOOR,     // floor, rounding toward negative infinity
    CAST_CEIL,      // ceil, rounding toward positive infinity
    CAST_ROUND,     // round, rounding off
    CAST_TRUNC,     // trunc, rounding toward zero
    CAST_ODD,       // Von Neumann rounding, rounding to the nearest odd number
};

For Cast, the conversion can only be float-to-half (f322f16) or float-to-int32_t (f322s32). The supported RoundMode values are as follows:

• f322f16: CAST_ODD
• f322s32: CAST_ROUND, CAST_CEIL, CAST_FLOOR, and CAST_RINT.

For details about the precision conversion rules of Cast, see Table 1.

valueIn

Input

Scalar whose data type is to be converted.