Eigen::Tensor binaryExpr()

`binaryExpr()` is a member function of the `Eigen::Tensor` class in the Eigen library for C++. It returns an object representing a binary expression between two tensors. A binary expression is an operation that involves two tensors and produces a new tensor as a result, such as element-wise addition or multiplication. The `binaryExpr()` function takes two arguments: the first is the other tensor involved in the expression, and the second is a binary function object that defines the operation to be performed.

For example, the following code creates two tensors `A` and `B` and computes their element-wise product using a binary expression:

Eigen::Tensor<float, 2> A(2, 3);
Eigen::Tensor<float, 2> B(2, 3);
// initialize A and B with values
Eigen::Tensor<float, 2> C = A.binaryExpr(B, [](float a, float b) { return a * b; });

In this example, the lambda function `[](float a, float b) { return a * b; }` defines the element-wise multiplication operation. The resulting tensor `C` will have the same dimensions as `A` and `B`, and each element of `C` will be the product of the corresponding elements in `A` and `B`.