src/transformers/models/wav2vec2/modeling_wav2vec2.py/Wav2Vec2FeatureProjection/forward
class Wav2Vec2FeatureProjection:    def forward(self, hidden_states):
        # non-projected hidden states are needed for quantization
        norm_hidden_states = self.layer_norm(hidden_states)
        hidden_states = self.projection(norm_hidden_states)
        hidden_states = self.dropout(hidden_states)
        return hidden_states, norm_hidden_states