Journal article Open Access

Energy Efficient In-Memory Hyperdimensional Encoding for Spatio-Temporal Signal Processing

Karunaratne, Geethan; Le Gallo, Manuel; Hersche, Michael; Cherubini, Giovanni; Benini, Luca; Sebastian, Abu; Rahimi, Abbas


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{
  "DOI": "10.1109/TCSII.2021.3068126", 
  "author": [
    {
      "family": "Karunaratne, Geethan"
    }, 
    {
      "family": "Le Gallo, Manuel"
    }, 
    {
      "family": "Hersche, Michael"
    }, 
    {
      "family": "Cherubini, Giovanni"
    }, 
    {
      "family": "Benini, Luca"
    }, 
    {
      "family": "Sebastian, Abu"
    }, 
    {
      "family": "Rahimi, Abbas"
    }
  ], 
  "issued": {
    "date-parts": [
      [
        2021, 
        3, 
        25
      ]
    ]
  }, 
  "abstract": "<p>The emerging brain-inspired computing paradigm known as hyperdimensional computing (HDC) has been proven to provide a lightweight learning framework for various cognitive tasks compared to the widely used deep learning-based approaches. Spatio-temporal (ST) signal processing, which encompasses biosignals such as electromyography (EMG) and electroencephalography (EEG), is one family of applications that could benefit from an HDC-based learning framework. At the core of HDC lie manipulations and comparisons of large bit patterns, which are inherently ill-suited to conventional computing platforms based on the von-Neumann architecture. In this work, we propose an architecture for ST signal processing within the HDC framework using predominantly in-memory compute arrays. In particular, we introduce a methodology for the in-memory hyperdimensional encoding of ST data to be used together with an in-memory associative search module. We show that the in-memory HDC encoder for ST signals offers at least 1.80&times; energy efficiency gains, 3.36&times; area gains, as well as 9.74&times; throughput gains compared with a dedicated digital hardware implementation. At the same time it achieves a peak classification accuracy within 0.04% of that of the baseline HDC framework.</p>", 
  "title": "Energy Efficient In-Memory Hyperdimensional Encoding for Spatio-Temporal Signal Processing", 
  "type": "article-journal", 
  "id": "5301648"
}
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