Wolfram Language Paclet Repository
Community-contributed installable additions to the Wolfram Language
Wolfram`TensorNetworks`
ActivateTensors  |
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runs the activation in two passes. The inner pass activates only; the outer pass activates remaining heads, including and . Two passes are required because activating the outer can expose new heads inside.
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Before activation the expression is rewritten by two replacement rules. expands to a of copies of . This pattern arises in when an output index appears more times than in any input — the multiplicity broadcasting case.
n
t
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SymbolicIdentityArray
SymbolicDeltaProductArray
SymbolicDeltaProductArray
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Use to collapse the symbolic contraction tree returned by into a numerical tensor. The shortcut is , which is equivalent to .
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Examples
(9)
Basic Examples
(2)
Activate inactive tensor operations in an expression:
In[1]:=
A=RandomReal[{-1,1},{2,3}];B=RandomReal[{-1,1},{3,4}];expr=Inactive[TensorContract][Inactive[TensorProduct][A,B],{{2,3}}]
Out[1]=
TensorContract[{{0.763892,0.554565,0.0827398},{-0.806229,0.608086,-0.554211}}{{0.325347,0.756967,-0.891212,-0.140357},{-0.140566,0.417286,0.818867,0.816652},{-0.117338,-0.571961,-0.797053,0.468545}},{{2,3}}]
Evaluate the inactive expression:
In[2]:=
 | ActivateTensors |
Out[2]=
{{0.160868,0.762329,-0.292622,0.384436},{-0.282751,-0.0395562,1.6582,0.350082}}
Activate a transpose of an inactive contraction:
In[1]:=
| ActivateTensors |
Out[1]=
{{0.160868,-0.282751},{0.762329,-0.0395562},{-0.292622,1.6582},{0.384436,0.350082}}
Scope
(4)
Applications
(1)
Properties & Relations
(2)
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