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tensorflow has no attribute session
The Session
API has been deprecated in TensorFlow 2.x and is no longer available. In TensorFlow 2.x, you can use the eager execution mode, which allows you to execute TensorFlow operations immediately as they are called, without needing to explicitly create a Session
object.
If you are using a code written for TensorFlow 1.x that uses Session
, you may need to modify it to work with TensorFlow 2.x. Instead of creating a Session
object and running the computation graph through it, you can simply execute TensorFlow operations directly.
Here’s an example of how to run a simple computation using TensorFlow 2.x:
lessimport tensorflow as tf a = tf.constant(2) b = tf.constant(3) c = a + b print(c.numpy()) # Output: 5
In this example, we create two constant tensors a
and b
and add them together using the +
operator. We then use the numpy()
method to get the value of the c
tensor as a NumPy array.
You can find more information about migrating from TensorFlow 1.x to TensorFlow 2.x in the TensorFlow documentation.
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the session graph is empty. add operations to the graph before calling run().
It looks like you are encountering an error related to TensorFlow.
This error typically occurs when you are trying to run a TensorFlow session without defining any operations or variables within the session graph.
To fix this error, you need to define some operations or variables before calling the run()
method on the session object. Here is an example of how you can define a simple graph in TensorFlow:
makefileimport tensorflow as tf # Define a constant tensor a = tf.constant(3.0) # Define a variable tensor b = tf.Variable(4.0) # Define a computation graph c = a * b # Initialize all variables init = tf.global_variables_initializer() # Create a session object sess = tf.Session() # Initialize all variables sess.run(init) # Evaluate the computation graph result = sess.run(c) # Print the result print(result)
In this example, we first define a constant tensor a
and a variable tensor b
. We then define a computation graph by multiplying a
and b
and storing the result in c
. Finally, we create a session object, initialize all variables using init
, and evaluate the computation graph by calling sess.run(c)
. The result of the computation is printed to the console.
Make sure to define some operations or variables in your TensorFlow graph before calling run()
on the session object to avoid the “session graph is empty” error.
Install tensorflow v1
Sure, here are the steps to install TensorFlow v1:
- Create a new virtual environment for TensorFlow v1 using Anaconda or virtualenv. For example, to create a virtual environment called “tf1” with Python 3.6, run:
luaconda create -n tf1 python=3.6
- Activate the virtual environment. For example, to activate the “tf1” environment, run:
conda activate tf1
- Install TensorFlow v1 using pip. Run the following command to install the CPU version of TensorFlow v1:
pip install tensorflow==1.15
If you want to install the GPU version of TensorFlow v1, run the following command instead:
pip install tensorflow-gpu==1.15
- Verify the installation by running a simple TensorFlow v1 program. For example, you can run the following code to print “Hello, TensorFlow!” using TensorFlow v1:
pythonimport tensorflow as tf hello = tf.constant('Hello, TensorFlow!') sess = tf.Session() print(sess.run(hello))
If everything is installed correctly, you should see “Hello, TensorFlow!” printed to the console.
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