QuantizeDownAndShrinkRange

public final class QuantizeDownAndShrinkRange

Convert the quantized 'input' tensor into a lower-precision 'output', using the

actual distribution of the values to maximize the usage of the lower bit depth and adjusting the output min and max ranges accordingly.

[input_min, input_max] are scalar floats that specify the range for the float interpretation of the 'input' data. For example, if input_min is -1.0f and input_max is 1.0f, and we are dealing with quint16 quantized data, then a 0 value in the 16-bit data should be interpreted as -1.0f, and a 65535 means 1.0f.

This operator tries to squeeze as much precision as possible into an output with a lower bit depth by calculating the actual min and max values found in the data. For example, maybe that quint16 input has no values lower than 16,384 and none higher than 49,152. That means only half the range is actually needed, all the float interpretations are between -0.5f and 0.5f, so if we want to compress the data into a quint8 output, we can use that range rather than the theoretical -1.0f to 1.0f that is suggested by the input min and max.

In practice, this is most useful for taking output from operations like QuantizedMatMul that can produce higher bit-depth outputs than their inputs and may have large potential output ranges, but in practice have a distribution of input values that only uses a small fraction of the possible range. By feeding that output into this operator, we can reduce it from 32 bits down to 8 with minimal loss of accuracy.

Constants

String OP_NAME The name of this op, as known by TensorFlow core engine

Public Methods

static <U extends TType > QuantizeDownAndShrinkRange <U>
create ( Scope scope, Operand <? extends TType > input, Operand < TFloat32 > inputMin, Operand < TFloat32 > inputMax, Class<U> outType)
Factory method to create a class wrapping a new QuantizeDownAndShrinkRange operation.
Output <U>
Output < TFloat32 >
outputMax ()
The float value that the maximum quantized output value represents.
Output < TFloat32 >
outputMin ()
The float value that the minimum quantized output value represents.

Inherited Methods

Constants

public static final String OP_NAME

The name of this op, as known by TensorFlow core engine

Constant Value: "QuantizeDownAndShrinkRange"

Public Methods

public static QuantizeDownAndShrinkRange <U> create ( Scope scope, Operand <? extends TType > input, Operand < TFloat32 > inputMin, Operand < TFloat32 > inputMax, Class<U> outType)

Factory method to create a class wrapping a new QuantizeDownAndShrinkRange operation.

Parameters
scope current scope
inputMin The float value that the minimum quantized input value represents.
inputMax The float value that the maximum quantized input value represents.
outType The type of the output. Should be a lower bit depth than Tinput.
Returns
  • a new instance of QuantizeDownAndShrinkRange

public Output <U> output ()

public Output < TFloat32 > outputMax ()

The float value that the maximum quantized output value represents.

public Output < TFloat32 > outputMin ()

The float value that the minimum quantized output value represents.