Python Numpy: Random number in a loop

I have such code and use Jupyter-Notebook

for j in range(timesteps):    
    a_int = np.random.randint(largest_number/2) # int version

and i get random numbers, but when i try to move part of code to the functions, i start to receive same number in each iteration

def create_train_data():        
    np.random.seed(seed=int(time.time()))     
    a_int = np.random.randint(largest_number/2) # int version
    return a

for j in range(timesteps):    
    c = create_train_data()  

Why it's happend and how to fix it? i think maybe it because of processes in Jupyter-Notebook