#!/usr/bin/env?python3
“““
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“““

import?os
import?sys
import?logging?as?log
from?openvino.inference_engine?import?IENetwork?IEPlugin


class?Network:
????“““
????Load?and?configure?inference?plugins?for?the?specified?target?devices?
????and?performs?synchronous?and?asynchronous?modes?for?the?specified?infer?requests.
????“““

????def?__init__（self）:
????????self.net?=?None
????????self.plugin?=?None
????????self.input_blob?=?None
????????self.out_blob?=?None
????????self.net_plugin?=?None
????????self.infer_request_handle?=?None

????def?load_model（self?model?device?input_size?output_size?num_requests?cpu_extension=None?plugin=None）:
????????“““
?????????Loads?a?network?and?an?image?to?the?Inference?Engine?plugin.
????????:param?model:?.xml?file?of?pre?trained?model
????????:param?cpu_extension:?extension?for?the?CPU?device
????????:param?device:?Target?device
????????:param?input_size:?Number?of?input?layers
????????:param?output_size:?Number?of?output?layers
????????:param?num_requests:?Index?of?Infer?request?value.?Limited?to?device?capabilities.
????????:param?plugin:?Plugin?for?specified?device
????????:return:??Shape?of?input?layer
????????“““

????????model_xml?=?model
????????model_bin?=?os.path.splitext（model_xml）[0]?+?“.bin“
????????#?Plugin?initialization?for?specified?device
????????#?and?load?extensions?library?if?specified
????????if?not?plugin:
????????????log.info（“Initializing?plugin?for?{}?device...“.format（device））
????????????self.plugin?=?IEPlugin（device=device）
????????else:
????????????self.plugin?=?plugin

????????if?cpu_extension?and?‘CPU‘?in?device:
????????????self.plugin.add_cpu_extension（cpu_extension）

????????#?Read?IR
????????log.info（“Reading?IR...“）
????????self.net?=?IENetwork（model=model_xml?weights=model_bin）
????????log.info（“Loading?IR?to?the?plugin...“）

????????if?self.plugin.device?==?“CPU“:
????????????supported_layers?=?self.plugin.get_s