# Copyright 2019 Google LLC
#
#
# Licensed under the Apache License, Version 2.0 (the "License");
# you may not use this file except in compliance with the License.
# You may obtain a copy of the License at
#
# http://www.apache.org/licenses/LICENSE-2.0
#
# Unless required by applicable law or agreed to in writing, software
# distributed under the License is distributed on an "AS IS" BASIS,
# WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
# See the License for the specific language governing permissions and
# limitations under the License.
# ==============================================================================
""" "create subtractor quantizer."""
from qkeras.qtools.quantized_operators import (
adder_factory,
adder_impl,
quantizer_impl,
)
[docs]
class ISubtractor(adder_factory.IAdder):
"""Create a subtractor instance.
The methods in subtractor is mostly inherited from adder
with a few exceptions.
"""
[docs]
def make_quantizer(
self,
quantizer_1: quantizer_impl.IQuantizer,
quantizer_2: quantizer_impl.IQuantizer,
):
"""make an ISubtractor instance.
if quantizer1 and quantizer2 are both non-signed, result should change
to signed; else since a sign bit is already present,
no need to add extra sign bit
Args:
quantizer_1: first operand
quantizer_2: second operand
Returns:
An ISubtractor instance
"""
quantizer = super().make_quantizer(quantizer_1, quantizer_2)
if not isinstance(quantizer, adder_impl.FloatingPoint_Adder):
if not quantizer_1.is_signed and not quantizer_2.is_signed:
quantizer.output.is_signed = 1
quantizer.output.bits += 1
return quantizer