In tensorflow, I am experiencing an issue where I try to get the output of my last neuron by running it in a session but it gives me an error. I am running Python 3.8.5 and TensorFlow 1.15 (because of some hardware issues)
Here is my code:
import warnings
warnings.filterwarnings("ignore")
import numpy as np
import tensorflow as tf
def main():
x_inputs = tf.Variable(np.array([[1, 2 ,3], [1, 2, 3]]), dtype=tf.float32)
y_outputs = tf.Variable(np.array([[1, 2, 4], [2, 3, 4]]), dtype=tf.float32)
model = create_model(x_inputs, y_outputs)
def create_model(x: np.array, y: np.array):
var_init = tf.global_variables_initializer()
with tf.Session() as sess:
sess.run(var_init)
x_val = sess.run(x).flatten()
y_val = sess.run(y).flatten()
# neural network architecture
input_layer = tf.layers.dense(x, units=len(x_val), activation=tf.nn.sigmoid)
hidden_layer = tf.layers.dense(input_layer, units=5, activation=tf.nn.relu)
output_layer = tf.layers.dense(hidden_layer, units=2, activation=tf.nn.softmax)
print(sess.run(output_layer))
if __name__ == "__main__":
main()
Here's the error:
Traceback (most recent call last):
File "/Applications/anaconda3/lib/python3.8/site-packages/tensorflow/python/client/session.py", line 1350, in _do_call
return fn(*args)
File "/Applications/anaconda3/lib/python3.8/site-packages/tensorflow/python/client/session.py", line 1327, in _run_fn
return tf_session.TF_Run(session, options,
File "/Applications/anaconda3/lib/python3.8/site-packages/tensorflow/python/framework/errors_impl.py", line 470, in __exit__
raise _make_specific_exception(
tensorflow.python.framework.errors_impl.FailedPreconditionError: Attempting to use uninitialized value dense_2/bias
[[Node: dense_2/bias/read = Identity[T=DT_FLOAT, _class=["loc:@dense_2/bias"], _device="/job:localhost/replica:0/task:0/device:CPU:0"](dense_2/bias)]]
During handling of the above exception, another exception occurred:
Traceback (most recent call last):
File "learning.py", line 29, in <module>
main()
File "learning.py", line 10, in main
model = create_model(x_inputs, y_outputs)
File "learning.py", line 26, in create_model
print(sess.run(output_layer))
File "/Applications/anaconda3/lib/python3.8/site-packages/tensorflow/python/client/session.py", line 894, in run
result = self._run(None, fetches, feed_dict, options_ptr,
File "/Applications/anaconda3/lib/python3.8/site-packages/tensorflow/python/client/session.py", line 1127, in _run
results = self._do_run(handle, final_targets, final_fetches,
File "/Applications/anaconda3/lib/python3.8/site-packages/tensorflow/python/client/session.py", line 1343, in _do_run
return self._do_call(_run_fn, self._session, feeds, fetches, targets,
File "/Applications/anaconda3/lib/python3.8/site-packages/tensorflow/python/client/session.py", line 1363, in _do_call
raise type(e)(node_def, op, message)
tensorflow.python.framework.errors_impl.FailedPreconditionError: Attempting to use uninitialized value dense_2/bias
[[Node: dense_2/bias/read = Identity[T=DT_FLOAT, _class=["loc:@dense_2/bias"], _device="/job:localhost/replica:0/task:0/device:CPU:0"](dense_2/bias)]]
Caused by op 'dense_2/bias/read', defined at:
File "learning.py", line 29, in <module>
main()
File "learning.py", line 10, in main
model = create_model(x_inputs, y_outputs)
File "learning.py", line 24, in create_model
output_layer = tf.layers.dense(hidden_layer, units=2, activation=tf.nn.softmax)
File "/Applications/anaconda3/lib/python3.8/site-packages/tensorflow/python/layers/core.py", line 253, in dense
return layer.apply(inputs)
File "/Applications/anaconda3/lib/python3.8/site-packages/tensorflow/python/layers/base.py", line 762, in apply
return self.__call__(inputs, *args, **kwargs)
File "/Applications/anaconda3/lib/python3.8/site-packages/tensorflow/python/layers/base.py", line 636, in __call__
self.build(input_shapes)
File "/Applications/anaconda3/lib/python3.8/site-packages/tensorflow/python/layers/core.py", line 139, in build
self.bias = self.add_variable('bias',
File "/Applications/anaconda3/lib/python3.8/site-packages/tensorflow/python/layers/base.py", line 498, in add_variable
variable = vs.get_variable(name,
File "/Applications/anaconda3/lib/python3.8/site-packages/tensorflow/python/ops/variable_scope.py", line 1256, in get_variable
return get_variable_scope().get_variable(
File "/Applications/anaconda3/lib/python3.8/site-packages/tensorflow/python/ops/variable_scope.py", line 1091, in get_variable
return var_store.get_variable(
File "/Applications/anaconda3/lib/python3.8/site-packages/tensorflow/python/ops/variable_scope.py", line 429, in get_variable
return _true_getter(
File "/Applications/anaconda3/lib/python3.8/site-packages/tensorflow/python/ops/variable_scope.py", line 399, in _true_getter
return self._get_single_variable(
File "/Applications/anaconda3/lib/python3.8/site-packages/tensorflow/python/ops/variable_scope.py", line 798, in _get_single_variable
v = variables.Variable(
File "/Applications/anaconda3/lib/python3.8/site-packages/tensorflow/python/ops/variables.py", line 220, in __init__
self._init_from_args(
File "/Applications/anaconda3/lib/python3.8/site-packages/tensorflow/python/ops/variables.py", line 376, in _init_from_args
self._snapshot = array_ops.identity(self._variable, name="read")
File "/Applications/anaconda3/lib/python3.8/site-packages/tensorflow/python/ops/array_ops.py", line 127, in identity
return gen_array_ops.identity(input, name=name)
File "/Applications/anaconda3/lib/python3.8/site-packages/tensorflow/python/ops/gen_array_ops.py", line 2133, in identity
_, _, _op = _op_def_lib._apply_op_helper(
File "/Applications/anaconda3/lib/python3.8/site-packages/tensorflow/python/framework/op_def_library.py", line 785, in _apply_op_helper
op = g.create_op(op_type_name, inputs, output_types, name=scope,
File "/Applications/anaconda3/lib/python3.8/site-packages/tensorflow/python/framework/ops.py", line 3152, in create_op
ret = Operation(
File "/Applications/anaconda3/lib/python3.8/site-packages/tensorflow/python/framework/ops.py", line 1625, in __init__
self._traceback = self._graph._extract_stack() # pylint: disable=protected-access
FailedPreconditionError (see above for traceback): Attempting to use uninitialized value dense_2/bias
[[Node: dense_2/bias/read = Identity[T=DT_FLOAT, _class=["loc:@dense_2/bias"], _device="/job:localhost/replica:0/task:0/device:CPU:0"](dense_2/bias)]]
Please help me I'm really struggling.
Thanks in advance!
question from:
https://stackoverflow.com/questions/65918754/failedpreconditionerror-when-running-output-layer-in-session 
