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In page Technological singularity:

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It is difficult to directly compare silicon-based hardware with neurons. But Berglas (2008) harvtxt error: no target: CITEREFBerglas2008 (help) notes that computer speech recognition is approaching human capabilities, and that this capability seems to require 0.01% of the volume of the brain. This analogy suggests that modern computer hardware is within a few orders of magnitude of being as powerful as the human brain, as well as taking up a lot less space. However, the costs of training systems with deep learning may be larger.[citation needed][a]