diff --git a/index.bs b/index.bs
index b9c65936..eaae629e 100644
--- a/index.bs
+++ b/index.bs
@@ -1217,7 +1217,7 @@ partial interface MLGraphBuilder {
   <div class=algorithm-steps>
     1. [=Assert=]: |op| is one of "argMin", "argMax".
     1. If |options|.{{MLArgMinMaxOptions/axes}} [=map/exists=], if any of its elements is not in [=the range=] 0 to |input|'s [=MLOperand/rank=], exclusive, then [=exception/throw=] a "{{DataError}}" {{DOMException}}.
-    1. Let |outputShape| be the result of invoking the underlying implementation for calculating reduction output dimensions, given |options|.
+    1. Let |outputShape| be the result of [=MLGraphBuilder/calculating reduction output sizes=] given |input|'s [=MLOperand/shape=], |options|.{{MLArgMinMaxOptions/axes}} (if it [=map/exists=]), and |options|.{{MLArgMinMaxOptions/keepDimensions}}.
     1. Let |desc| be a new {{MLOperandDescriptor}}.
     1. Set |desc|.{{MLOperandDescriptor/dataType}} to {{MLOperandDataType/"int64"}}.
     1. Set |desc|.{{MLOperandDescriptor/dimensions}} to |outputShape|.
@@ -1794,7 +1794,28 @@ partial interface MLGraphBuilder {
 </div>
 
 <details open algorithm>
+  <summary>
+    To <dfn for=MLGraphBuilder>calculate conv output size</dfn> given unsigned integers |inputSize|, |filterSize|, |beginningPadding|, |endingPadding|, |stride| and |dilation|, perform these steps. They return a number.
+  </summary>
+  <div class=algorithm-steps>
+    1. Let |effectiveFilterSize| be ( |filterSize| - 1 ) * |dilation| + 1.
+    1. Let |outputSize| be ( |inputSize| - |effectiveFilterSize| + |beginningPadding| + |endingPadding| ) / |stride| + 1.
+    1. Return |outputSize|.
+  </div>
+</details>
 
+<details open algorithm>
+  <summary>
+    To <dfn for=MLGraphBuilder>calculate conv2d output sizes</dfn> given unsigned integers |inputHeight|, |inputWidth|, |filterHeight| and |filterWidth|, [=/list=] of 4 unsigned integers |padding|, [=/list=] of 2 unsigned integers |strides|, and [=/list=] of 2 unsigned integers |dilations|, perform these steps. They return a [=/list=] of 2 numbers.
+  </summary>
+  <div class=algorithm-steps>
+    1. Let |outputHeight| be the result of [=MLGraphBuilder/calculating conv output size=] given |inputHeight|, |filterHeight|, |padding|[0], |padding|[1], |strides|[0] and |dilations|[0].
+    1. Let |outputWidth| be the result of [=MLGraphBuilder/calculating conv output size=] given |inputWidth|, |filterWidth|, |padding|[2], |padding|[3], |strides|[1] and |dilations|[1].
+    1. Return « |outputHeight|, |outputWidth| ».
+  </div>
+</details>
+
+<details open algorithm>
   <summary>
     The <dfn method for=MLGraphBuilder>conv2d(|input|, |filter|, |options|)</dfn> method steps are:
   </summary>
@@ -1817,7 +1838,47 @@ partial interface MLGraphBuilder {
     1. If |options|.{{MLConv2dOptions/bias}} [=map/exists=]:
         1. If |options|.{{MLConv2dOptions/bias}}'s [=MLOperand/rank=] is not 1, then [=exception/throw=] a {{TypeError}}.
         1. If |options|.{{MLConv2dOptions/bias}}'s [=MLOperand/dataType=] is not the same as |input|'s [=MLOperand/dataType=], then [=exception/throw=] a {{TypeError}}.
-    1. Let |outputShape| be the result of invoking the underlying implementation for calculating output dimensions, given |options|.
+    1. *Calculate the output shape:*
+        1. Switch on |options|.{{MLConv2dOptions/inputLayout}}:
+            <dl class=switch>
+                : {{MLInputOperandLayout/"nchw"}}
+                ::
+                    1. Let |batches| be |inputShape|[0].
+                    1. Let |channels| be |inputShape|[1].
+                    1. Let |inputHeight| be |inputShape|[2].
+                    1. Let |inputWidth| be |inputShape|[3].
+                : {{MLInputOperandLayout/"nhwc"}}
+                ::
+                    1. Let |batches| be |inputShape|[0].
+                    1. Let |inputHeight| be |inputShape|[1].
+                    1. Let |inputWidth| be |inputShape|[2].
+                    1. Let |channels| be |inputShape|[3].
+            </dl>
+        1. Let |filterShape| be |filter|'s [=MLOperand/shape=].
+        1. Switch on |options|.{{MLConv2dOptions/filterLayout}}:
+            <dl class=switch>
+                : {{MLConv2dFilterOperandLayout/"hwio"}}
+                ::
+                    1. Let |filterHeight| be |filterShape|[0].
+                    1. Let |filterWidth| be |filterShape|[1].
+                : {{MLConv2dFilterOperandLayout/"ohwi"}}
+                : {{MLConv2dFilterOperandLayout/"ihwo"}}
+                ::
+                    1. Let |filterHeight| be |filterShape|[1].
+                    1. Let |filterWidth| be |filterShape|[2].
+                : {{MLConv2dFilterOperandLayout/"oihw"}}
+                ::
+                    1. Let |filterHeight| be |filterShape|[2].
+                    1. Let |filterWidth| be |filterShape|[3].
+            </dl>
+        1. Let |outputSizes| be the result of [=MLGraphBuilder/calculating conv2d output sizes=] given |inputHeight|, |inputWidth|, |filterHeight|, |filterWidth|, |options|.{{MLConv2dOptions/padding}}, |options|.{{MLConv2dOptions/strides}}, and |options|.{{MLConv2dOptions/dilations}}.
+        1. Switch on |options|.{{MLConv2dOptions/inputLayout}}:
+            <dl class=switch>
+                : {{MLInputOperandLayout/"nchw"}}
+                :: Let |outputShape| be « |batches|, |channels|, floor( |outputSizes|[0] ), floor( |outputSizes|[1] ) ».
+                : {{MLInputOperandLayout/"nhwc"}}
+                :: Let |outputShape| be « |batches|, floor( |outputSizes|[0] ), floor( |outputSizes|[1] ), |channels|  ».
+            </dl>
     1. If |outputShape| is not the same as the shape of |options|.{{MLConv2dOptions/bias}}'s [=MLOperand/shape=], then [=exception/throw=] a "{{DataError}}" {{DOMException}}.
     1. Let |desc| be a new {{MLOperandDescriptor}}.
     1. Set |desc|.{{MLOperandDescriptor/dataType}} to |input|'s [=MLOperand/dataType=].
@@ -1943,6 +2004,28 @@ partial interface MLGraphBuilder {
     *outputSize = (inputSize - 1) ** *stride + (filterSize - 1) ** *dilation + 1 - beginningPadding - endingPadding + outputPadding*
 </div>
 
+<details open algorithm>
+  <summary>
+    To <dfn for=MLGraphBuilder>calculate convtranspose output size</dfn> given unsigned integers |inputSize|, |filterSize|, |beginningPadding|, |endingPadding|, |stride|, |dilation|, and |outputPadding|, perform these steps. They return a number.
+  </summary>
+  <div class=algorithm-steps>
+    1. Let |effectiveFilterSize| be ( |filterSize| - 1 ) * |dilation| + 1.
+    1. Let |outputSize| be ( |inputSize| - 1 ) * |stride| + |effectiveFilterSize| - |beginningPadding| - |endingPadding| + |outputPadding|.
+    1. Return |outputSize|.
+  </div>
+</details>
+
+<details open algorithm>
+  <summary>
+    To <dfn for=MLGraphBuilder>calculate convtranspose2d output sizes</dfn> given unsigned integers |inputHeight|, |inputWidth|, |filterHeight| and |filterWidth|, [=/list=] of 4 unsigned integers |padding|, [=/list=] of 2 unsigned integers |strides|, [=/list=] of 2 unsigned integers |dilations|, and [=/list=] of 2 unsigned integers |outputPadding|, perform these steps. They return a [=/list=] of 2 numbers.
+  </summary>
+  <div class=algorithm-steps>
+    1. Let |outputHeight| be the result of [=MLGraphBuilder/calculating convtranspose output size=] given |inputHeight|, |filterHeight|, |padding|[0], |padding|[1], |strides|[0], |dilations|[0], and |outputPadding|[0].
+    1. Let |outputWidth| be the result of [=MLGraphBuilder/calculating convtranspose output size=] given |inputWidth|, |filterWidth|, |padding|[2], |padding|[3], |strides|[1], |dilations|[1] and |outputPadding|[1].
+    1. Return « |outputHeight|, |outputWidth| ».
+  </div>
+</details>
+
 <details open algorithm>
 
   <summary>
@@ -1971,7 +2054,46 @@ partial interface MLGraphBuilder {
     1. If |options|.{{MLConvTranspose2dOptions/bias}} [=map/exists=]:
         1. If |options|.{{MLConvTranspose2dOptions/bias}}'s [=MLOperand/rank=] is not 1, then [=exception/throw=] a {{TypeError}}.
         1. If |options|.{{MLConvTranspose2dOptions/bias}}'s [=MLOperand/dataType=] is not the same as |input|'s [=MLOperand/dataType=], then [=exception/throw=] a {{TypeError}}.
-    1. Let |outputShape| be the result of invoking the underlying implementation for calculating output dimensions, given |options|.
+    1. *Calculate the output shape:*
+        1. Switch on |options|.{{MLConvTranspose2dOptions/inputLayout}}:
+            <dl class=switch>
+                : {{MLInputOperandLayout/"nchw"}}
+                ::
+                    1. Let |batches| be |inputShape|[0].
+                    1. Let |channels| be |inputShape|[1].
+                    1. Let |inputHeight| be |inputShape|[2].
+                    1. Let |inputWidth| be |inputShape|[3].
+                : {{MLInputOperandLayout/"nhwc"}}
+                ::
+                    1. Let |batches| be |inputShape|[0].
+                    1. Let |inputHeight| be |inputShape|[1].
+                    1. Let |inputWidth| be |inputShape|[2].
+                    1. Let |channels| be |inputShape|[3].
+            </dl>
+        1. Let |filterShape| be |filter|'s [=MLOperand/shape=].
+        1. Switch on |options|.{{MLConvTranspose2dOptions/filterLayout}}:
+            <dl class=switch>
+                : {{MLConvTranspose2dFilterOperandLayout/"iohw"}}
+                ::
+                    1. Let |filterHeight| be |filterShape|[2].
+                    1. Let |filterWidth| be |filterShape|[3].
+                : {{MLConvTranspose2dFilterOperandLayout/"hwoi"}}
+                ::
+                    1. Let |filterHeight| be |filterShape|[0].
+                    1. Let |filterWidth| be |filterShape|[1].
+                : {{MLConvTranspose2dFilterOperandLayout/"ohwi"}}
+                ::
+                    1. Let |filterHeight| be |filterShape|[1].
+                    1. Let |filterWidth| be |filterShape|[2].
+            </dl>
+        1. Let |outputSizes| be the result of [=MLGraphBuilder/calculating convtranspose2d output sizes=] given |inputHeight|, |inputWidth|, |filterHeight|, |filterWidth|, |options|.{{MLConvTranspose2dOptions/padding}}, |options|.{{MLConvTranspose2dOptions/strides}}, |options|.{{MLConvTranspose2dOptions/dilations}}, and |options|.{{MLConvTranspose2dOptions/outputPadding}}.
+        1. Switch on |options|.{{MLConvTranspose2dOptions/inputLayout}}:
+            <dl class=switch>
+                : {{MLInputOperandLayout/"nchw"}}
+                :: Let |outputShape| be « |batches|, |channels|, floor( |outputSizes|[0] ), floor( |outputSizes|[1] ) ».
+                : {{MLInputOperandLayout/"nhwc"}}
+                :: Let |outputShape| be « |batches|, floor( |outputSizes|[0] ), floor( |outputSizes|[1] ), |channels| ».
+            </dl>
     1. If |outputShape| is not the same as the shape of |options|.{{MLConvTranspose2dOptions/bias}}'s [=MLOperand/shape=], then [=exception/throw=] a "{{DataError}}" {{DOMException}}.
     1. Let |desc| be a new {{MLOperandDescriptor}}.
     1. Set |desc|.{{MLOperandDescriptor/dataType}} to |input|'s [=MLOperand/dataType=].
@@ -4407,6 +4529,54 @@ partial interface MLGraphBuilder {
     </pre>
 </div>
 
+<details open algorithm>
+  <summary>
+    To <dfn for=MLGraphBuilder>calculate pool2d output sizes</dfn> given {{MLInputOperandLayout}} |layout|, [=/list=] of 4 unsigned integers |inputShape|, {{MLRoundingType}} |roundingType|, [=/list=] of 2 unsigned integers |windowDimensions|, [=/list=] of 4 unsigned integers |padding|, [=/list=] of 2 unsigned integers |strides|, [=/list=] of 2 unsigned integers |dilations|, and optional [=/list=] of 2 unsigned integers |outputSizes|, perform these steps. They return a [=/list=] of 4 unsigned integers.
+  </summary>
+  <div class=algorithm-steps>
+    1. Switch on |layout|:
+        <dl class=switch>
+            : {{MLInputOperandLayout/"nchw"}}
+            ::
+                1. Let |batches| be |inputShape|[0].
+                1. Let |channels| be |inputShape|[1].
+                1. Let |inputHeight| be |inputShape|[2].
+                1. Let |inputWidth| be |inputShape|[3].
+            : {{MLInputOperandLayout/"nhwc"}}
+            ::
+                1. Let |batches| be |inputShape|[0].
+                1. Let |inputHeight| be |inputShape|[1].
+                1. Let |inputWidth| be |inputShape|[2].
+                1. Let |channels| be |inputShape|[3].
+        </dl>
+    1. If |outputSizes| is not given, then:
+        1. Let |outputHeight| be |outputSizes|[0].
+        1. Let |outputWidth| be |outputSizes|[1].
+    1. Otherwise:
+        1. Let |outputSizes| be the result of [=MLGraphBuilder/calculating conv2d output sizes=] given |inputHeight|, |inputWidth|, |windowDimensions|[0], |windowDimensions|[1], |padding|, |strides|, and |dilations|.
+        1. Let |outputHeight| be |outputSizes|[0].
+        1. Let |outputWidth| be |outputSizes|[1].
+        1. Switch on |roundingType|
+            <dl class=switch>
+                : {{MLRoundingType/"floor"}}
+                ::
+                    1. Set |outputWidth| to floor(|outputWidth|).
+                    1. Set |outputHeight| to floor(|outputHeight|).
+                : {{MLRoundingType/"ceil"}}
+                ::
+                    1. Set |outputWidth| to ceiling(|outputWidth|).
+                    1. Set |outputHeight| to ceiling(|outputHeight|).
+            </dl>
+    1. Switch on |layout|:
+        <dl class=switch>
+            : {{MLInputOperandLayout/"nchw"}}
+            :: Return « |batches|, |channels|, |outputHeight|, |outputWidth| ».
+            : {{MLInputOperandLayout/"nhwc"}}
+            :: Return « |batches|, |outputHeight|, |outputWidth|, |channels| ».
+        </dl>
+  </div>
+</details>
+
 <details open algorithm>
   <summary>
     To <dfn for="MLGraphBuilder" data-lt="pooling-op">create pooling operation</dfn> given [=string=] |op|, {{MLOperand}} |input| and {{MLPool2dOptions}} |options|, run the following steps:
@@ -4430,7 +4600,7 @@ partial interface MLGraphBuilder {
     1. Let |desc| be a copy of |input|.{{MLOperand/[[descriptor]]}}.
     1. If any of the following sub-steps fail, [=exception/throw=] an "{{OperationError}}" {{DOMException}}.
         1. Make a request to the underlying platform to:
-            1. Calculate the output dimensions given |input| and |options|. Set |desc|.{{MLOperandDescriptor/dimensions}} to that.
+            1. Set |desc|.{{MLOperandDescriptor/dimensions}} to the result of [=MLGraphBuilder/calculating pool2d output sizes=] given |options|.{{MLPool2dOptions/layout}}, |input|'s [=MLOperand/shape=], |options|.{{MLPool2dOptions/roundingType}}, |options|.{{MLPool2dOptions/windowDimensions}}, |options|.{{MLPool2dOptions/padding}}, |options|.{{MLPool2dOptions/strides}}, |options|.{{MLPool2dOptions/dilations}}, and |options|.{{MLPool2dOptions/outputSizes}} (if it [=map/exists=]).
             1. Let |output| be the result of [=creating an MLOperand=] given [=this=] and |desc|.
             1. Let |opImpl| be [=platform operator=] for the |op| pooling operation, given |options|.
             1. Set |output|.{{MLOperand/[[operator]]}} to |opImpl|.
@@ -4589,6 +4759,25 @@ partial interface MLGraphBuilder {
         - *SumSquare*: Compute the sum of the square of all the input values along the axes.
 </div>
 
+<details open algorithm>
+  <summary>
+    To <dfn for="MLGraphBuilder">calculate reduction output sizes</dfn>, given a [=/list=] of unsigned integers |inputShape|, a optional [=/list=] of unsigned integers |axes|, and [=/boolean=] |keepDimensions|, perform the following steps. They return a new [=/list=] of unsigned integers.
+  </summary>
+  <div class=algorithm-steps>
+    1. Let |inputSize| be |inputShape|'s [=list/size=].
+    1. If |axes| is not given, let |axes| be [=the range=] 0 to |inputSize|, exclusive.
+    1. If |keepDimensions| is true, then:
+        1. Let |outputShape| be a [=list/clone=] of |inputShape|.
+        1. [=list/For each=] |axis| of |axes|:
+            1. Set |outputShape|[|axis|] to 1.
+    1. Otherwise:
+        1. Let |outputShape| be an empty [=/list=].
+        1. [=list/For each=] |index| in [=the range=] 0 to |inputSize|, exclusive:
+            1. If |axes| does not [=list/contain=] |index|, then [=list/append=] |inputShape|[|index|].
+    1. Return |outputShape|.
+  </div>
+</details>
+
 <details open algorithm>
   <summary>
     To <dfn for="MLGraphBuilder" data-lt="reduce-op">create reduce operation</dfn> given [=string=] |op|, {{MLOperand}} |input| and {{MLReduceOptions}} |options|, run the following steps:
@@ -4596,7 +4785,7 @@ partial interface MLGraphBuilder {
   <div class=algorithm-steps>
     1. [=Assert=]: |op| is one of "reduceL1", "reduceL2", "reduceLogSum", "reduceLogSumExp", "reduceMax", "reduceMean", "reduceMin", "reduceProduct", "reduceSum", "reduceSumSquare".
     1. If |options|.{{MLReduceOptions/axes}} [=map/exists=], if any of its elements is not in [=the range=] 0 to |input|'s [=MLOperand/rank=], exclusive, then [=exception/throw=] a "{{DataError}}" {{DOMException}}.
-    1. Let |outputShape| be the result of invoking the underlying implementation for calculating reduction output dimensions, given |options|.
+    1. Let |outputShape| be the result of [=MLGraphBuilder/calculating reduction output sizes=] given |input|'s [=MLOperand/shape=], |options|.{{MLReduceOptions/axes}} (if it [=map/exists=]), and |options|.{{MLReduceOptions/keepDimensions}}.
     1. Let |desc| be a new {{MLOperandDescriptor}}.
     1. Set |desc|.{{MLOperandDescriptor/dataType}} to |input|'s [=MLOperand/dataType=].
     1. Set |desc|.{{MLOperandDescriptor/dimensions}} to |outputShape|.