## Tensor to NumPy: NumPy Array To Tensorflow Tensor And Back

Tensor to NumPy - Convert a NumPy array to a Tensorflow Tensor as well as convert a TensorFlow Tensor to a NumPy array

### < > Code:

You must be a Member to view code

Access all courses and lessons, gain confidence and expertise, and learn how things work and how to use them.

or Log In

### Transcript:

Today, we’re going to learn how to convert between NumPy arrays and TensorFlow tensors and back.

We’re going to begin by creating a file: numpy-arrays-to-tensorflow-tensors-and-back.py.

```
# command line
e numpy-arrays-to-tensorflow-tensors-and-back.py
```

We’re going to import TensorFlow as tf, that’s the standard, and import NumPy as np.

```
# numpy-arrays-to-tensorflow-tensors-and-back.py file
import tensorflow as tf
import numpy as np
```

We’re going to begin by generating a NumPy array by using the random.rand method to generate a 3 by 2 random matrix using NumPy.

```
# numpy-arrays-to-tensorflow-tensors-and-back.py file
# ...
np_array = np.random.rand(3, 2)
```

If we run the code, we can see that it’s just a standard NumPy array.

```
# command line
python numpy-arrays-to-tensorflow-tensors-and-back.py
```

But then I’m going to create a standard TensorFlow session using the tf.Session method.

```
# numpy-arrays-to-tensorflow-tensors-and-back.py file
# ...
sess = tf.Session()
```

We’re then going to use a session to convert the NumPy array into TensorFlow tensor using the tf.constant method.

```
# numpy-arrays-to-tensorflow-tensors-and-back.py file
# ...
with sess.as_default():
tensor = tf.constant(np_array)
```

And then we’re going to print that tensor

```
# numpy-arrays-to-tensorflow-tensors-and-back.py file
# ...
print(tensor)
```

so you’re going to see that it actually is a TensorFlow tensor.

```
# command line
python numpy-arrays-to-tensorflow-tensors-and-back.py
```

As you see, it is a tensor.

Finally, we’re going to convert it back by using the tensor.eval method.

```
# numpy-arrays-to-tensorflow-tensors-and-back.py file
# ...
numpy_array_2 = tensor.eval()
print(numpy_array_2)
```

As you can see, we’ve got our original NumPy array back.

```
# command line
python numpy-arrays-to-tensorflow-tensors-and-back.py
```