4. Data types

Currently, PopXL supports the data types listed in Table 4.1. These data types are defined in popxl directly and will be converted to their IPU-compatible data type. Note that if the session option popart.SessionOptions.enableSupportedDataTypeCasting is set to True, then int64 and uint64 will be downcast to int32 and uint32, respectively.

Table 4.1 Data types in PopXL

PopXL dtype	int	floating point	signed	NumPy dtype	Python dtype	alias
bool	False	False	False	bool	builtins.bool	N/A
int8	True	False	True	int8	None	N/A
int32	True	False	True	int32	None	N/A
uint8	True	False	False	uint8	None	N/A
uint32	True	False	False	uint32	None	N/A
float16	False	True	True	float16	None	half
float32	False	True	True	float32	builtins.float	float
float64	False	True	True	float64	None	double