src/transformers/models/detr/modeling_detr.py/DetrLearnedPositionEmbedding/__init__
class DetrLearnedPositionEmbedding:    def __init__(self, embedding_dim=256):
        super().__init__()
        self.row_embeddings = nn.Embedding(50, embedding_dim)
        self.column_embeddings = nn.Embedding(50, embedding_dim)