I have the error mentioned in the title, with the following code
import tensorflow as tf import numpy as np import pandas as pd import seaborn as sns from random import shuffle import datetime from matplotlib import pyplot from numpy import mean from numpy import std from matplotlib import pyplot from sklearn.model_selection import KFold from tensorflow.keras.datasets import mnist from tensorflow.keras.utils import to_categorical from tensorflow.keras.models import Sequential from tensorflow.keras.layers import Conv2D from tensorflow.keras.layers import MaxPooling2D from tensorflow.keras.layers import Dense from tensorflow.keras.layers import Flatten from tensorflow.keras.optimizers import SGD from tensorflow.keras.models import load_model first_branch= Input(shape=(28,28,1)) first_branch_st1 = Conv2D(32, (3, 3), activation='relu', input_shape=(28, 28,1))(first_branch) first_branch_st2 = MaxPooling2D((2, 2))(first_branch_st1) first_branch_st3 = Flatten()(first_branch_st2) first_branch_st4 = Dense(100, activation='relu')(first_branch_st3)
This sends the following error
ValueError Traceback (most recent call last) /tmp/ipykernel_1973/3453405928.py in <module> 2 first_branch_st1 = Conv2D(32, (3, 3), activation='relu', input_shape=(28, 28,1))(first_branch) 3 first_branch_st2 = MaxPooling2D((2, 2))(first_branch_st1) ----> 4 first_branch_st3 = Flatten()(first_branch_st2) 5 first_branch_st4 = Dense(100, activation='relu')(first_branch_st3) 6 ValueError: Attempt to convert a value (None) with an unsupported type (<class 'NoneType'>) to a Tensor.
According to the question asked with the same error it happens when you mix up keras and tf.keras. But i think have defined the imports accordingly, so unless there is a clash between imports or a bad definition of them i do not think that’s the problem. There is another known solution?
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Answer
There’s only 1 bug, Input
is not defined but still unrelated to the error mentioned. Use below:
first_branch= tf.keras.Input(shape=(28,28,1))
My advice is to please check on the latest versions of tf
e.g. 2.4.1
.