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"""
Copyright (c) 2018 Intel Corporation
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.
"""
import numpy as np
from extensions.ops.lstm_sequence import LSTMSequence
from mo.front.extractor import FrontExtractorOp
from mo.front.onnx.extractors.utils import onnx_attr
from mo.ops.op import Op
class LSTMFrontExtractor(FrontExtractorOp):
op = 'LSTM'
enabled = True
@staticmethod
def extract(node):
def split_helper(node, index: int, direction: str):
return Op._create_data_node(
node.graph,
name=node.name + '/SplittedBiLSTM/{}/'.format(direction),
attrs={'value': node.value[index], 'shape': np.array(node.value[index].shape, dtype=np.int64)}
)
attrs = {
'hidden_size': np.array(onnx_attr(node, 'hidden_size', 'i'), dtype=np.int64),
'batch_dim': 1,
'sequence_dim': 0,
'blobs_wrb': True,
'has_num_directions': True,
'direction': onnx_attr(node, 'direction', 's', b'forward').decode().lower(),
'format': 'onnx',
'blob_bidirectional_split': lambda node: (
split_helper(node, 0, 'forward'),
split_helper(node, 1, 'reverse')
)
}
LSTMSequence.update_node_stat(node, attrs)
return __class__.enabled
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