<s>
Contrastive	B-Algorithm
Hebbian	I-Algorithm
learning	I-Algorithm
is	O
a	O
biologically	O
plausible	O
form	O
of	O
Hebbian	O
learning	O
.	O
</s>
<s>
In	O
2003	O
,	O
contrastive	B-Algorithm
Hebbian	I-Algorithm
learning	I-Algorithm
was	O
shown	O
to	O
be	O
equivalent	O
in	O
power	O
to	O
the	O
backpropagation	B-Algorithm
algorithms	O
commonly	O
used	O
in	O
machine	O
learning	O
.	O
</s>
