IEEE Circuits and Systems Magazine - Q2 2020 - 44

Table 3.
Summary of the strategies used in HD computing for accuracy and efficiency improvement.
Model Type**
Applications

Encode*

base/
level

train

test

PlatformT

AccuracyH

AccelerationF

Motivation

Application

QuantHD
[25]

1

B/B

B/T

B/T

F, C, G

Re, shuffle

Q, DR, F

speedup +
accuracy

speech, activity,
face, phone
position

VoiceHD
[28]

1

B/B

B

B

C

NN, Re

DR, B

Replace deep speech
learning

CompHD
[51]

3

P

N

N

F

N

DR, Comp

DR without
accuracy
loss

activity, gesture,
valve monitoring

AdaptHD
[54]

1

B/B

N

B

C

Re, N

B, Adapt

accuracy +
short time
Re

speech, face,
activity,
Cardiotocograms

BinHD [35]

1

B/B

B

B

C

Re

B

speedup

speech, face,
activity,
Cardiotocograms

SemiHD
[53]

1

B/B

B

B

F, C

Re, N

DR, B

Replace deep 17 popular
learning
datasets [63]

Language
[21]

2

B

B

B

F

\

B

energy
saving +
robustness

language
recognition

Character
[56]

3

B

B

B

\

Binary

DR

data
classification
in IoT

character
recognition

Laelap [43]

1

B

B

B

C, G

\

\

energy
efficiency

seizure detection

* three encoding methods. 1: record-based encoding, 2: N-gram-based encoding, 3: a novel method.
** symbol "/" is used in record-based encoding. B: binary, P: bipolar, T: Ternary, N: non-binary.
T
 implementation platforms. F: FPGA, C: CPU, G: GPU.
H
 strategies for accuracy improvement. Re: retraining, N: non-binary model, NN: neural network.
F
 strategies for efficiency improvement. DR: dimension reduction, Q: quantization, B: binarization, F: FPGA, Comp: compression, Adapt: adaptive.

Table 4.
Partial list of applications based on HD computingF in [40].
Applications

Inputs (#)*

Classes (#)**

HD (%)

Baseline (%)

Language recognition [21, 30]

1

21

96.70%

97.90%

Text categorization [64]

1

8

94.20%

86.40%

Speech recognition [28]

1

26

95.30%

93.60%

EMG gesture recognition [23]

4

5

97.80%

89.70%

Flexible EMG gesture recognition [27]

64

5

96.60%

88.90%

EEG brain-machine interface [65]

64

2

74.50%

69.50%

ECoG seizure detection [66]

100

2

95.40%

94.30%

DNA sequencing [31]

1

\

99.74%

94.53%

Character recognition [56]

1

10

89.94%

\

* represents the number of input data.
** represents the number of class hypervectors to be trained and stored in the associative memory.
F
 Other works, like [67, 68, 69, 70, 71, 72, 73, 74], are not listed in this table..

44 	

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