Correct mistake in autograd_tutorial.py (#1367)

taha-yassine · holly1238 · web-flow · commit 666e12a5da2a · 2021-04-07T10:15:35.000-07:00
Co-authored-by: holly1238 &lt;77758406+holly1238@users.noreply.github.com&gt;
diff --git a/beginner_source/blitz/autograd_tutorial.py b/beginner_source/blitz/autograd_tutorial.py
@@ -170,14 +170,12 @@
 # vector-Jacobian product. That is, given any vector :math:`\vec{v}`, compute the product
 # :math:`J^{T}\cdot \vec{v}`
 #
-# If :math:`v` happens to be the gradient of a scalar function
+# If :math:`\vec{v}` happens to be the gradient of a scalar function :math:`l=g\left(\vec{y}\right)`:
 #
 # .. math::
 #
 #
-#    l
-#    =
-#    g\left(\vec{y}\right)
+#   \vec{v}
 #    =
 #    \left(\begin{array}{ccc}\frac{\partial l}{\partial y_{1}} & \cdots & \frac{\partial l}{\partial y_{m}}\end{array}\right)^{T}
 #

Original file line number	Diff line number	Diff line change
`@@ -170,14 +170,12 @@`
`170`	`170`	# vector-Jacobian product. That is, given any vector :math:`\vec{v}`, compute the product
`171`	`171`	# :math:`J^{T}\cdot \vec{v}`
`172`	`172`	`#`
`173`		-# If :math:`v` happens to be the gradient of a scalar function
	`173`	+# If :math:`\vec{v}` happens to be the gradient of a scalar function :math:`l=g\left(\vec{y}\right)`:
`174`	`174`	`#`
`175`	`175`	`# .. math::`
`176`	`176`	`#`
`177`	`177`	`#`
`178`		`-# l`
`179`		`-# =`
`180`		`-# g\left(\vec{y}\right)`
	`178`	`+# \vec{v}`
`181`	`179`	`# =`
`182`	`180`	`# \left(\begin{array}{ccc}\frac{\partial l}{\partial y_{1}} & \cdots & \frac{\partial l}{\partial y_{m}}\end{array}\right)^{T}`
`183`	`181`	`#`