src/transformers/models/wav2vec2/modeling_tf_wav2vec2.py/TFWav2Vec2FeatureExtractor/call
class TFWav2Vec2FeatureExtractor:    def call(self, input_values):
        hidden_states = tf.expand_dims(input_values, -1)
        for conv_layer in self.conv_layers:
            hidden_states = conv_layer(hidden_states)
        return hidden_states