keras 2.4.0

• Use compat module when using set_session and get_session. (#1046)
• Allows passing other arguments to keras_model eg name. (#1045)
• Fixed bug when serializing models with the plaidml backends.(#1084)
• Install keras no longer tries to install scipy because it's already installed by tensorflow (#1081)
• Fixed bug with layer_text_vectorization with TensorFlow >= 2.3 (#1131)
• Handle renamed argument text to input_text in text_one_hot (#1133)
• Added TensorFlow 2.3 to the CI (#1102)
• Fix C stack error when using Image Data Generators and Time Series generators with TensorFlow <= 2.0.1 (#1135)
• Fixed warning raised in the initial epoch (@gsteinbu #1130)
• Consistent result when using text_hashing_trick with missing values (@topepo #1048)
• Added a custom error message for k_logsumexp as it was removed from Keras (#1137)
• Fixed bug when printing models that are not built yet. (#1138)
• Fix drop_duplicates DeprecationWarning with tf 2.3 (@gsteinbu #1139 #1141)
• Fixed bug when plotting the model history if the model used an early stopping callback (#1140)
• install_keras now installs a fixed version of h5py, because newer versions are backward incompatible. (#1142)
• Simplify testing utilities by using a helper-* file. (#1173)
• Deprecated hdf5_matrix if using TF >= 2.4 (#1175)
• Fixed TensorFlow nightly installation on CI (#1176)
• Support for TensorFlow v2.4: just small fixes for custom classes. (#1177)
• Added untar argument to get_file as it seems to be slightly different from extract (#1179)
• Warn when not using the tensorflow implementation of Keras (#1181)
• Added layer_layer_normalization (#1183)
• Added layer_multihead_attention (#1184)
• Added image_dataset_from_directory (#1185)
• Fixed bug when using a custom layer with a time distributed adverb. (#1188)
• Added the ragged argument to layer_input. (#1193)
• Fixed *_generator deadlocks with recent versions of TensorFlow (#1197)