IEEE Consumer Electronics Magazine - May/June 2023 - 34

DNN Migration in IoTs
FIGURE 4. Framework of information flow.
cloud server, respectively, are used to obtain the
execution time and index of DNN subtasks. The
application Program2 installed on the client is
used to generate the migration plan. The information
flow between the edge/cloud server and
the client is as follows: First, we install Program1
on the client, run each DNN subtask, and record
the execution time and index of the DNN subtask
as file1. Then, the edge/cloud server cannot
determine which DNN subtask will be executed,
so the edge/cloud server cannot collect the execution
delay of each DNN subtask like the client
does. Install Program2 on the edge/cloud server,
where Program2 uses regression functions to create
prediction functions for DNN subtasks,
which can estimate the execution delay of each
DNN subtask under the edge/cloud server based
on the parameters of the DNN and the server.
Then, record the execution time and index of
each DNN subtask as file2. Finally, when the user
enters the computing environment, Program1 on
the client runs and obtains file1. At the same
time, Program2 will send the prediction results of
each DNN subtask file2 to the client. Then,
Program3 on the client combines file1 and file2 to
create a migration plan.
34
Running Phase: Operate Migration Plan
Existing DNN partition-uploading methods
are mainly applied to the situation from a single
local device to a single edge/cloud server. We
will execute the DNN query while uploading DNN
partitions P3, so two threads are required: 1)
Upload thread: upload DNN model and 2) Query
thread: execute real-time DNN query.
Upload Thread The application Program2 first
creates a partition-offloading plan to obtain the
DNN partition P1 and its distribution on the
edge/cloud server, and then creates a partitionuploading
plan to obtain the DNN partition P3
(P3 is divided by the DNN partition P1) and its
upload sequence on the edge/cloud server. Then
the upload thread starts to run the partitionuploading
plan. First, the upload thread sends
the first DNN partition P3 in the partition-uploading
plan from the client to the edge/cloud server,
and sends the confirmation result (CR) of the
DNN partition P3 offloading back to the client. If
the upload thread receives a failed result CR, it
resends the DNN partition P3 to the edge/cloud
server. Conversely, if the upload thread receives
a successful result CR, it sends the next DNN
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IEEE Consumer Electronics Magazine - May/June 2023

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