Why do I receive an error when running Python code in cmd prmpt using Tensorflow?

Question

How can Tensorflow have no "div" attribute? When I try to run a python program from the command prompt (from tensorflow for dummies page 23 (simple program) I receive this error:

C:\Users\ME\TENSORFLOW\ch3>python simple_math.py
2020-04-26 13:50:29.871436: W tensorflow/stream_executor/platform/default/dso_loader.cc:55] Could not load dynamic library 'cudart64_101.dll'; dlerror: cudart64_101.dll not found
2020-04-26 13:50:29.880652: I tensorflow/stream_executor/cuda/cudart_stub.cc:29] Ignore above cudart dlerror if you do not have a GPU set up on your machine.
2020-04-26 13:50:32.204590: W tensorflow/stream_executor/platform/default/dso_loader.cc:55] Could not load dynamic library 'nvcuda.dll'; dlerror: nvcuda.dll not found
2020-04-26 13:50:32.212936: E tensorflow/stream_executor/cuda/cuda_driver.cc:351] failed call to cuInit: UNKNOWN ERROR (303)
2020-04-26 13:50:32.228615: I tensorflow/stream_executor/cuda/cuda_diagnostics.cc:169] retrieving CUDA diagnostic information for host: DESKTOP-C7DH370
2020-04-26 13:50:32.236344: I tensorflow/stream_executor/cuda/cuda_diagnostics.cc:176] hostname: DESKTOP-C7DH370
Traceback (most recent call last):
  File "simple_math.py", line 13, in <module>
    quot = tf.div(const_a, const_b)
AttributeError: module 'tensorflow' has no attribute 'div'

Did I install a wrong version of python? I installed python 3.7. Or perhaps I did not install tensorflow correctly. The book tensorflow for dummies was published in 2018. Maybe it was intended for another version of python? and/or another version of tensorflow? thank you so much in advance

Here is the code of the "simple.math.py" :

''' Perform simple math operations with TensorFlow '''

    from __future__ import absolute_import
    from __future__ import division
    from __future__ import print_function

    import tensorflow as tf

    # Math with constant tensors
    const_a = tf.constant(3.6)
    const_b = tf.constant(1.2)
    total = const_a + const_b
    quot = tf.div(const_a, const_b)

    # Math with random tensors
    rand_a = tf.random_normal([3], 2.0)
    rand_b = tf.random_uniform([3], 1.0, 4.0)
    diff = tf.subtract(rand_a, rand_b)

    # Vector multiplication
    vec_a = tf.linspace(0.0, 3.0, 4)
    vec_b = tf.fill([4, 1], 2.0)
    prod = tf.multiply(vec_a, vec_b)
    dot = tf.tensordot(vec_a, vec_b, 1)

    # Matrix multiplication
    mat_a = tf.constant([[2, 3], [1, 2], [4, 5]])
    mat_b = tf.constant([[6, 4, 1], [3, 7, 2]])
    mat_prod = tf.matmul(mat_a, mat_b)

   # Execute the operations
      with tf.Session() as sess:
        print('Sum: %f' % sess.run(total))
        print('Quotient: %f' % sess.run(quot))
        print('Difference: ', sess.run(diff))
        print('Element-wise product: ', sess.run(prod))
        print('Dot product: ', sess.run(dot))
        print('Matrix product: ', sess.run(mat_prod))


   thank you



After running the following program on windows with latest tensorflow 
installed, I receive the message underneath the python code below:

''' A simple TensorFlow application '''

from __future__ import absolute_import
from __future__ import division
from __future__ import print_function

import tensorflow as tf

# Create tensor
msg = tf.strings.join(['Hello ', 'TensorFlow!'])

# Launch session
with tf.Session() as sess:
    print(sess.run(msg))



(venv) C:\Users\ME\TENSORFLOW\ch2>python hello_tensorflow.py
2020-04-29 00:28:30.676246: W 

tensorflow/stream_executor/platform/default/dso_loader.cc:55] Could not load 
dynamic library 'cudart64_101.dll'; dlerror: cudart64_101.dll not found
    2020-04-29 00:28:30.684568: I 
tensorflow/stream_executor/cuda/cudart_stub.cc:29] Ignore above cudart 
dlerror 
if you do not have a GPU set up on your machine.
    2020-04-29 00:28:32.573201: W 
tensorflow/stream_executor/platform/default/dso_loader.cc:55] Could not 
load dynamic library 'nvcuda.dll'; dlerror: nvcuda.dll not found
    2020-04-29 00:28:32.580400: E 
tensorflow/stream_executor/cuda/cuda_driver.cc:313] failed call to cuInit: 
UNKNOWN ERROR (303)
    2020-04-29 00:28:32.591791: I 
tensorflow/stream_executor/cuda/cuda_diagnostics.cc:169] retrieving CUDA 
diagnostic information for host: DESKTOP-C7DH370
    2020-04-29 00:28:32.599756: I 
tensorflow/stream_executor/cuda/cuda_diagnostics.cc:176] hostname: 
DESKTOP- 
C7DH370
    2020-04-29 00:28:32.615405: I 
tensorflow/compiler/xla/service/service.cc:168] XLA service 0x1e0678689e0 
initialized for platform Host (this does not guarantee that XLA will be 
used). 
Devices:
    2020-04-29 00:28:32.623598: I 
tensorflow/compiler/xla/service/service.cc:176]   StreamExecutor device 
(0): 
Host, Default Version
    Traceback (most recent call last):
      File "hello_tensorflow.py", line 13, in <module>
        with tf.Session() as sess:
    AttributeError: module 'tensorflow' has no attribute 'Session'

Hello Steven. Please post your code as we will not go to the book reference and find your program. — 0xA
– 0xA, Commented Apr 26, 2020 at 20:26
Can you add your tensorflow version and python version. I ran your code with no errors. — 0xA
– 0xA, Commented Apr 26, 2020 at 22:43
python 3.6.4 and tensorflow was installed with the command "pip3 install tensorflow" I'm not sure I am installing it correctly. Do I change directories in the command prompt to where python is installed and then enter "pip3 install tensorflow" ? Thank you — Steven Dascoli
– Steven Dascoli, Commented Apr 26, 2020 at 23:23
Changing the directories will not matter. Check my answer and please comment if you have a question. otherwise if it helped you mark it as accepted so you can help others. — 0xA
– 0xA, Commented Apr 26, 2020 at 23:42
I am on the official tensorflow site and I am following the directions. I downloaded pyhon 3.8 and checked all boxes, I installed Microsoft Visual C++. long paths are enabled When I come up to the step of entering "pip3 install -U pip virtualenv" on the command line, I receive the folowing error: ERROR: Could not install packages due to an EnvironmentError: [WinError 5] Access is denied: 'c:\\program files\\python38\\lib\\site-packages\\pip-19.2.3.dist-info\\entry_points.txt' Consider using the --user option or check the permissions. — Steven Dascoli
– Steven Dascoli, Commented Apr 29, 2020 at 0:10

user11530462 · Accepted Answer · 2021-10-27 10:06:03Z

Tensorflow 2.x working sample code

import tensorflow as tf

# Math with constant tensors
const_a = tf.constant(3.6)
const_b = tf.constant(1.2)
total = const_a + const_b
quot = tf.divide(const_a, const_b)
print(quot)

# Math with random tensors
rand_a = tf.random_normal([3], 2.0)
rand_b = tf.random_uniform([3], 1.0, 4.0)
diff = tf.subtract(rand_a, rand_b)
print(diff)

# Vector multiplication
vec_a = tf.linspace(0.0, 3.0, 4)
vec_b = tf.fill([4, 1], 2.0)
prod = tf.multiply(vec_a, vec_b)
dot = tf.tensordot(vec_a, vec_b, 1)
print(dot)

# Matrix multiplication
mat_a = tf.constant([[2, 3], [1, 2], [4, 5]])
mat_b = tf.constant([[6, 4, 1], [3, 7, 2]])
mat_prod = tf.matmul(mat_a, mat_b)
print(mat_prod)

Output

Tensor("truediv_3:0", shape=(), dtype=float32)
Tensor("Sub_4:0", shape=(3,), dtype=float32)
Tensor("Tensordot_4:0", shape=(1,), dtype=float32)
Tensor("MatMul_4:0", shape=(3, 3), dtype=int32)

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