Fix: No Context TFF error for Fed Training

tools/federated-training/app/processing/text_processing/federated_algorithm.py

@@ -20,7 +20,7 @@ def model_fn():
 def federated_computation_new(train_dataset,test_dataset):
     import tensorflow as tf
     import tensorflow_federated as tff
-    
+    #TFF must be imported here, to guarantee that the context is initialised
 
     if(globals.INPUT_SPEC == None):
         #should never reach this place because INPUT_SPEC is instantiated inside get_preprocessed_train_test_data.