# tensor dot product

• ### Vector and Tensor AlgebraTU/e

2010-8-31 · 1.1.6 Tensor product The tensor product of two vectors represents a dyad which is a linear vector transformation. A dyad is a special tensorto be discussed later which explains the name of this product. Because it is often denoted without a symbol between the two vectors it is also referred to as the open product. The tensor product is not commutative.

• ### tf.tensordot TensorFlow Core v2.5.0

2021-6-18 · Tensordot (also known as tensor contraction) sums the product of elements from a and b over the indices specified by a_axes and b_axes . The lists a_axes and b_axes specify those pairs of axes along which to contract the tensors. The axis a_axes i of a must have the same dimension as axis b_axes i of b for all i in range (0 len (a_axes)).

• ### Dot product of the vector r and second order tensor

2018-10-24 · T = r 2 δ i j x i x j r 3 e i e j. is symmetric. For a rank n tensor T the situation is even more complicated. Because now the notion of T ⋅ v needs extra clarification. It is a good idea to write T ⋅ m v meaning the dot product is done over the m th component. Or better yet avoid using dot

• ### Difference between Tensor product dot product and the

2017-9-3 · Difference between Tensor product dot product and the action of dual vector on a vector. Ask Question Asked 3 years 10 months ago. Active 2 months ago. Viewed 3k times 3 4 begingroup In the book Schutz on general relativity I have come across the dot product between vectors the action of a dual vector on a vector (or also a tensor on

• ### Tensor productHandWiki

2021-2-7 · As the dot product is a scalar the metric tensor is thus seen to deserve its name. There is one metric tensor at each point of the manifold and variation in the metric tensor thus encodes how distance and angle concepts and so the laws of analytic geometry vary throughout the manifold.

• ### tensor dot product in kerasIntellipaat

2019-7-27 · tensor dot product in keras . tensor dot product in keras. 0 votes . 1 view. asked Jul 27 2019 in Data Science by sourav (17.6k points) I am new to keras and got some problems understanding the keras.layers.Dot() layer. I am trying to calculate a dot product of two vectors. from keras.layers import Input Dot.

• ### Tensor productHandWiki

2021-2-7 · As the dot product is a scalar the metric tensor is thus seen to deserve its name. There is one metric tensor at each point of the manifold and variation in the metric tensor thus encodes how distance and angle concepts and so the laws of analytic geometry vary throughout the manifold.

• ### 1 Introduction to the Tensor ProductMIT

2020-12-30 · The tensor product V ⊗ W is thus deﬁned to be the vector space whose elements are (complex) linear combinations of elements of the form v ⊗ w with v ∈ V w ∈ W with the above rules for manipulation. The tensor product V ⊗ W is the complex vector space of

• ### numpy.tensordot — NumPy v1.14 ManualSciPy

2018-1-8 · Compute tensor dot product along specified axes for arrays >= 1-D. Given two tensors (arrays of dimension greater than or equal to one) a and b and an array_like object containing two array_like objects (a_axes b_axes) sum the products of a s and b s elements (components) over the axes specified by a_axes and b_axes.

• ### Vector Matrix and Tensor Derivatives

2017-3-26 · taking the dot product between the 3rd row of W and the vector x y 3 = XD j=1 W 3j x j (2) At this point we have reduced the original matrix equation (Equation 1) to a scalar equation. This makes it much easier to compute the desired derivatives. 1.2 Removing summation notation

• ### Divergence of product of tensor and vector Physics Forums

2013-3-23 · where dot in the 2nd term in the rhs is double contraction of tensors and ∇v0 is the gradient of the vector v0 (which is a tensor). Fredrik the dot product here is same as contraction as written by Dextercioby in post 6. The book I mentioned uses the standard definition of divergence of a dyadic.

• ### numpy.tensordot — NumPy v1.13 ManualSciPy

2017-6-10 · numpy.tensordot. ¶. Compute tensor dot product along specified axes for arrays >= 1-D. Given two tensors (arrays of dimension greater than or equal to one) a and b and an array_like object containing two array_like objects (a_axes b_axes) sum the products of a s and b s elements (components) over the axes specified by a_axes and b_axes.

• ### torch.tensordot — PyTorch 1.9.0 documentation

2021-7-22 · tensordot implements a generalized matrix product. Parameters. aLeft tensor to contract. bRight tensor to contract. dims (int or Tuple List List or List List containing two lists or Tensor)number of dimensions to contract or explicit lists of dimensions for a and b respectively

• ### numpy.tensordot — NumPy v1.13 ManualSciPy

2017-6-10 · numpy.tensordot. ¶. Compute tensor dot product along specified axes for arrays >= 1-D. Given two tensors (arrays of dimension greater than or equal to one) a and b and an array_like object containing two array_like objects (a_axes b_axes) sum the products of a s and b s elements (components) over the axes specified by a_axes and b_axes.

• ### Introduction to the Tensor ProductUC Santa Barbara

2012-3-11 · Introduction to the Tensor Product James C Hateley In mathematics a tensor refers to objects that have multiple indices. Roughly speaking this can be thought of as a multidimensional array. A good starting point for discussion the tensor product is the notion of direct sums. REMARK The notation for each section carries on to the next. 1

• ### 221A Lecture NotesHitoshi Murayama

2014-1-31 · 3 Tensor Product The word "tensor product" refers to another way of constructing a big vector space out of two (or more) smaller vector spaces. You can see that the spirit of the word "tensor" is there. It is also called Kronecker product or direct product. 3.1 Space You start with two vector spaces V that is n-dimensional and W that

• ### pytorch tensor.dot(tensor)_IPSG-CSDN

2019-6-24 · 1 RuntimeError dot Expected 1-D argument self but got 2-D(>=0.3.0) tensor.dot() . .1ok

• ### 1 Introduction to the Tensor ProductMIT

2020-12-30 · The tensor product V ⊗ W is thus deﬁned to be the vector space whose elements are (complex) linear combinations of elements of the form v ⊗ w with v ∈ V w ∈ W with the above rules for manipulation. The tensor product V ⊗ W is the complex vector space of

• ### Divergence of product of tensor and vector Physics Forums

2013-3-23 · where dot in the 2nd term in the rhs is double contraction of tensors and ∇v0 is the gradient of the vector v0 (which is a tensor). Fredrik the dot product here is same as contraction as written by Dextercioby in post 6. The book I mentioned uses the standard definition of divergence of a dyadic.

• ### A dot product between a vector and a tensorMathematics

2020-9-9 · A dot product between a vector and a tensor

• ### Pytorchdot mm matmul

2019-10-14 · 1. torch. mm () torch. mm (mat1 mat2 out=None) mat1 (nxm) mat2 (mxd) out (nxd) broadcast . torch. mm (input mat2 out=None) → Tensor #imputmat2 . input n x m mat2 m x p out n x p . # . .

• ### symbolsHow to type tensor multiplication with vertical

2021-6-6 · These are obviously binary operators so they should carry the same spacing. That is use whatever works and then wrap it in mathbin. While the original picture showed the bottom dots resting on the baseline I think it would be more correct to center the symbols on the math axis (where the cdot is placed). Here is a simple possibility that

• ### Reference — xtensor-blas documentation

2021-4-13 · Matrix vector and tensor products¶ template auto xt linalg dot (const xexpression xt const xexpression xo) ¶ Non-broadcasting dot function. In the case of two 1D vectors computes the vector dot product. In the case of complex vectors computes the dot product without conjugating the first argument.

• ### Dot product of the vector r and second order tensor

2018-10-24 · T = r 2 δ i j x i x j r 3 e i e j. is symmetric. For a rank n tensor T the situation is even more complicated. Because now the notion of T ⋅ v needs extra clarification. It is a good idea to write T ⋅ m v meaning the dot product is done over the m th component. Or better yet avoid using dot

• ### A dot product between a vector and a tensorMathematics

2020-9-9 · A dot product between a vector and a tensor. Ask Question Asked 10 months ago. Active 10 months ago. Viewed 127 times 0 begingroup I d like to understand how to write mathbf u cdotnablamathbf u in open form where mathbf u is the two dimensional velocity vector and nabla is the gradient operator. I d be glad if you could help

• ### numpy.tensordot — NumPy v1.21 Manual

2021-6-22 · numpy.tensordot(a b axes=2) source ¶ Compute tensor dot product along specified axes. Given two tensors a and b and an array_like object containing two array_like objects (a_axes b_axes) sum the products of a s and b s elements (components) over the axes specified by a_axes and b_axes.

• ### A Basic Operations of Tensor AlgebraSpringer

2017-8-27 · 170 A Basic Operations of Tensor Algebra a a b b ϕ ϕ 2π − ϕ na = a a (b··· a)naa b Fig. A.3 Scalar product of two vectors. a Angles between two vectors b unit vector and projection A.2.3 Scalar (Dot) Product of Two Vectors For any pair of vectors a and b a scalar α is deﬁned by α = a ·· b = abcos ϕ where ϕ is the angle between the vectors a and b.Asϕ one can use any

• ### Difference between Tensor product dot product and the

2017-9-3 · Difference between Tensor product dot product and the action of dual vector on a vector. Ask Question Asked 3 years 10 months ago. Active 2 months ago. Viewed 3k times 3 4 begingroup In the book Schutz on general relativity I have come across the dot product between vectors the action of a dual vector on a vector (or also a tensor on

• ### numpy.tensordot — NumPy v1.13 ManualSciPy

2017-6-10 · numpy.tensordot. ¶. Compute tensor dot product along specified axes for arrays >= 1-D. Given two tensors (arrays of dimension greater than or equal to one) a and b and an array_like object containing two array_like objects (a_axes b_axes) sum the products of a s and b s elements (components) over the axes specified by a_axes and b_axes.

• ### pythonTensorflow axis argument in dot product

2020-11-13 · The axes argument is used to specify dimensions in the input tensors that are "matched". Values along matched axes are multiplied and summed (like a dot product) so those matched dimensions are reduced from the output. axes can take two different forms If it is a single integer N then the last N dimensions of the first parameter are matched

• ### Tensor Arithmetics MTEX

2021-5-17 · The double dot product between two rank two tensors is essentially their inner product and can be equivalently computed from the trace of their matrix product. T1 T2 trace (T1 T2 ) trace (T1 T2) ans = 3.3131 ans = 3.3131 ans = 3.3131 Determinant. For rank two tensors we can compute the determinant of the tensor by the command det. det (T1)

• ### homework and exercisesMetric Tensor and Dot Product

2021-3-8 · In Euclidean space the value of the dot product is 11 but I do not know how to compute it with the help of the metric mentioned above. All I know that it should equal 11 because space is still flat represented in different coordinates. homework-and-exercises general-relativity differential-geometry metric-tensor coordinate-systems.

• ### 1 Introduction to the Tensor ProductMIT

2020-12-30 · The tensor product V ⊗ W is thus deﬁned to be the vector space whose elements are (complex) linear combinations of elements of the form v ⊗ w with v ∈ V w ∈ W with the above rules for manipulation. The tensor product V ⊗ W is the complex vector space of

• ### Dot product of tensors Physics Forums

2009-10-6 · Hello I was trying to follow a proof that uses the dot product of two rank 2 tensors as in A dot B. How is this dot product calculated A is 3x3 Aij and B is 3x3 Bij each a rank 2 tensor. Any help is greatly appreciated. Thanks sugarmolecule

• ### Tensor Arithmetics MTEX

2021-5-17 · The double dot product between two rank two tensors is essentially their inner product and can be equivalently computed from the trace of their matrix product. T1 T2 trace (T1 T2 ) trace (T1 T2) ans = 3.3131 ans = 3.3131 ans = 3.3131 Determinant. For rank two tensors we can compute the determinant of the tensor by the command det. det (T1)

• ### Dot product of tensors Physics Forums

2009-10-6 · I don t see a reason to call it a dot product though. To me that s just the definition of matrix multiplication and if we insist on thinking of U and V as tensors then the operation would usually be described as a contraction" of two indices of the rank 4 tensor that you get when you take what your text calls the "dyadic product" of U and V.

• ### Dot product of the vector r and second order tensor

2018-10-24 · T = r 2 δ i j x i x j r 3 e i e j. is symmetric. For a rank n tensor T the situation is even more complicated. Because now the notion of T ⋅ v needs extra clarification. It is a good idea to write T ⋅ m v meaning the dot product is done over the m th component. Or better yet avoid using dot

• ### Tensor-Tensor Product ToolboxGitHub Pages

2021-5-2 · 4 2.3 T-product and T-SVD For A 2Rn 1 n 2 n 3 we deﬁne unfold (A) = 2 6 6 6 6 4 A(1) A(2) A(n 3) 3 7 7 7 7 5fold unfold( A)) = where the unfold operator maps A to a matrix of size n 1n 3 n 2 and fold is its inverse operator. Deﬁnition 2.1. (T-product) 2 Let A 2Rn 1 n 2 n 3 and B 2Rn 2 Al n 3.Then the t-product B is deﬁned to be a tensor of size

• ### A dot product between a vector and a tensorMathematics

2020-9-9 · A dot product between a vector and a tensor. Ask Question Asked 10 months ago. Active 10 months ago. Viewed 127 times 0 begingroup I d like to understand how to write mathbf u cdotnablamathbf u in open form where mathbf u is the two dimensional velocity vector and nabla is the gradient operator. I d be glad if you could help

• ### pythonTensorflow axis argument in dot product

2020-11-13 · The axes argument is used to specify dimensions in the input tensors that are "matched". Values along matched axes are multiplied and summed (like a dot product) so those matched dimensions are reduced from the output. axes can take two different forms If it is a single integer N then the last N dimensions of the first parameter are matched