add mass mainstream weights

mass/mainstream/base_uncased_slab_desc_from_lp.bin

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mass/mainstream/base_uncased_slab_desc_from_title.bin

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mass/mainstream/base_uncased_slab_title_from_lp.bin

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mass/mainstream/mass-base-uncased-config.json

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+{
+	"encoder_embed_dim": 768,
+	"encoder_ffn_embed_dim": 3072,
+	"encoder_attention_heads": 12,
+	"encoder_layers": 6,
+	"encoder_normalize_before": 0,
+	"encoder_learned_pos": 1,
+	"decoder_learned_pos": 1,
+	"decoder_embed_dim": 768,
+	"decoder_ffn_embed_dim": 3072,
+	"decoder_layers": 6,
+	"decoder_attention_heads": 12,
+	"decoder_normalize_before": 0,
+	"attention_dropout": 0.1,
+	"activation_dropout": 0.1,
+	"activation_fn": "gelu",
+	"dropout": 0.1,
+	"adaptive_softmax_dropout": 0,
+	"share_decoder_input_output_embed": 1,
+	"share_all_embeddings": 1,
+	"no_token_positional_embeddings": 0,
+	"no_cross_attention": 0,
+	"cross_self_attention": 0,
+	"decoder_output_dim": 768,
+	"decoder_input_dim": 768,
+	"no_scale_embedding": 0,
+	"adaptive_input": 0,
+	"tie_adaptive_weights": 0,
+	"layernorm_embedding": 1,
+	"encoder_layerdrop": 0,
+	"decoder_layerdrop": 0,
+	"quant_noise_pq": 0,
+	"quant_noise_pq_block_size": 8,
+	"quant_noise_scalar": 0,
+	"is_encoder_decoder": 1,
+	"vocab_size": 30522
+}