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result.py
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# Copyright 2016 Google Inc.
#
# 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.
"""Speech result representations."""
from google.cloud.speech.alternative import Alternative
class Result(object):
"""Speech recognition result representation.
This is the object that comes back on sync or async requests
(but not streaming requests).
:type alternatives: list
:param alternatives: List of
:class:`~google.cloud.speech.alternative.Alternative`.
"""
def __init__(self, alternatives):
self.alternatives = alternatives
@classmethod
def from_pb(cls, result):
"""Factory: construct instance of ``SpeechRecognitionResult``.
:type result: :class:`~google.cloud.grpc.speech.v1beta1\
.cloud_speech_pb2.StreamingRecognizeResult`
:param result: Instance of ``StreamingRecognizeResult`` protobuf.
:rtype: :class:`~google.cloud.speech.result.SpeechRecognitionResult`
:returns: Instance of ``SpeechRecognitionResult``.
"""
alternatives = [Alternative.from_pb(result) for result
in result.alternatives]
return cls(alternatives=alternatives)
@property
def confidence(self):
"""Return the confidence for the most probable alternative.
:rtype: float
:returns: Confidence value, between 0 and 1.
"""
return self.alternatives[0].confidence
@property
def transcript(self):
"""Return the transcript for the most probable alternative.
:rtype: str
:returns: Speech transcript.
"""
return self.alternatives[0].transcript
class StreamingSpeechResult(object):
"""Streaming speech result representation.
:type alternatives: list
:param alternatives: List of
:class:`~google.cloud.speech.alternative.Alternative`.
:type is_final: bool
:param is_final: Boolean indicator of results finality.
:type stability: float
:param stability: 0.0-1.0 stability score for the results returned.
"""
def __init__(self, alternatives, is_final=False, stability=0.0):
self.alternatives = alternatives
self.is_final = is_final
self.stability = stability
@classmethod
def from_pb(cls, response):
"""Factory: construct instance of ``StreamingSpeechResult``.
:type response: :class:`~google.cloud.grpc.speech.v1beta1\
.cloud_speech_pb2.StreamingRecognizeResult`
:param response: Instance of ``StreamingRecognizeResult`` protobuf.
:rtype: :class:`~google.cloud.speech.result.StreamingSpeechResult`
:returns: Instance of ``StreamingSpeechResult``.
"""
alternatives = [Alternative.from_pb(result) for result
in response.alternatives]
is_final = response.is_final
stability = response.stability
return cls(alternatives=alternatives, is_final=is_final,
stability=stability)
@property
def confidence(self):
"""Return the confidence for the most probable alternative.
:rtype: float
:returns: Confidence value, between 0 and 1.
"""
return self.alternatives[0].confidence
@property
def transcript(self):
"""Return the transcript for the most probable alternative.
:rtype: str
:returns: Speech transcript.
"""
return self.alternatives[0].transcript