Type Info

The numerical properties of a oneflow.dtype can be accessed through either the oneflow.finfo or the oneflow.iinfo.

oneflow.finfo

class oneflow.finfo

A oneflow.finfo is an object that represents the numerical properties of a floating point oneflow.dtype, (i.e. oneflow.float32, oneflow.float64 and oneflow.float16). This is similar to numpy.finfo.

A oneflow.finfo provides the following attributes:

Name	Type	Description
bits	int	The number of bits occupied by the type.
eps	float	The smallest representable number such that 1.0 + eps != 1.0.
min	float	The largest representable number.
max	float	The smallest representable number (typically -max).
tiny	float	The smallest positive normal number. See notes.
resolution	float	The approximate decimal resolution of this type, i.e., 10**-precision.

For example:

>>> import oneflow as flow
>>> flow.finfo()
finfo(resolution=1e-06, min=-3.40282e+38, max=3.40282e+38, eps=1.19209e-07, tiny=1.17549e-38, dtype=oneflow.float32, bits=32)
>>> flow.finfo(flow.float)
finfo(resolution=1e-06, min=-3.40282e+38, max=3.40282e+38, eps=1.19209e-07, tiny=1.17549e-38, dtype=oneflow.float32, bits=32)
>>> flow.finfo(flow.float16).bits
16
>>> flow.finfo(flow.float16).max
65504.0

oneflow.iinfo

class oneflow.iinfo

A oneflow.iinfo is an object that represents the numerical properties of a integer oneflow.dtype (i.e. oneflow.uint8, oneflow.int8, oneflow.int16, oneflow.int32, and oneflow.int64). This is similar to numpy.iinfo.

A oneflow.iinfo provides the following attributes:

Name	Type	Description
bits	int	The number of bits occupied by the type.
min	float	The largest representable number.
max	float	The smallest representable number.

For example:

>>> import oneflow as flow
>>> flow.iinfo(flow.int8)
iinfo(min=-128, max=127, dtype=oneflow.int8, bits=8)
>>> flow.iinfo(flow.int).max
2147483647
>>> flow.iinfo(flow.int).bits
32