Kevin - 4 months ago 103

C++ Question

I'm creating a tensor like this:

`tensorflow::Tensor a(tensorflow::DT_FLOAT, tensorflow::TensorShape());`

I know how to fill a scalar value:

`a.scalar<float>()() = 8.0;`

But I don't know how to fill a tensor like [1, 4, 2].

Answer

There are a few options. If the tensor is really a small vector, like in your case, you can do the following :

```
tensorflow::Tensor a(tensorflow::DT_FLOAT, tensorflow::TensorShape(3));
a.vec<float>()(0) = 1.0f;
a.vec<float>()(1) = 4.0f;
a.vec<float>()(2) = 2.0f;
```

If you want to construct a slightly larger and/or multi-dimensional tensor, then `tensorflow::ops::Input::Initializer`

declared in `tensorflow/cc/framework/ops.h`

has many constructors that lets you construct a `Tensor`

from various kinds of C++ constants such as simple primitive constants and nested initializer lists representing a multi-dimensional array.

For example, if you want to construct a `2x2`

matrix, you can do the following :

```
#include "tensorflow/cc/framework/cc/ops.h"
tensorflow::ops::Input::Initializer a({{1, 2}, {3, 4}});
// a.tensor will be a Tensor with type DT_INT32 and shape {2, 2}.
```