def get_pretraining_model(model_name, ctx_l, max_seq_length=512):
cfg, tokenizer, _, _ = get_pretrained_bert(
model_name, load_backbone=False, load_mlm=False)
cfg = BertModel.get_cfg().clone_merge(cfg)
cfg.defrost()
cfg.MODEL.max_length = max_seq_length
cfg.freeze()
model = BertForPretrain(cfg)
model.initialize(ctx=ctx_l)
model.hybridize()
return cfg, tokenizer, model
def test_bert_small_cfg(compute_layout, ctx):
with ctx:
cfg = BertModel.get_cfg()
cfg.defrost()
cfg.MODEL.vocab_size = 100
cfg.MODEL.units = 12 * 4
cfg.MODEL.hidden_size = 64
cfg.MODEL.num_layers = 2
cfg.MODEL.num_heads = 2
cfg.MODEL.compute_layout = compute_layout
cfg.freeze()
# Generate TN layout
cfg_tn = cfg.clone()
cfg_tn.defrost()
cfg_tn.MODEL.layout = 'TN'
cfg_tn.freeze()
# Sample data
batch_size = 4
sequence_length = 8
num_mask = 3
inputs = mx.np.random.randint(0, 10, (batch_size, sequence_length))
token_types = mx.np.random.randint(0, 2, (batch_size, sequence_length))
valid_length = mx.np.random.randint(3, sequence_length, (batch_size,))
masked_positions = mx.np.random.randint(0, 3, (batch_size, num_mask))
# Test for BertModel
bert_model = BertModel.from_cfg(cfg)
bert_model.initialize()
bert_model.hybridize()
contextual_embedding, pooled_out = bert_model(inputs, token_types, valid_length)
bert_model_tn = BertModel.from_cfg(cfg_tn)
bert_model_tn.share_parameters(bert_model.collect_params())
bert_model_tn.hybridize()
contextual_embedding_tn, pooled_out_tn = bert_model_tn(inputs.T, token_types.T, valid_length)
assert_allclose(contextual_embedding.asnumpy(),
mx.np.swapaxes(contextual_embedding_tn, 0, 1).asnumpy(),
1E-4, 1E-4)
assert_allclose(pooled_out.asnumpy(), pooled_out_tn.asnumpy(), 1E-4, 1E-4)
# Test for BertForMLM
bert_mlm_model = BertForMLM(cfg)
bert_mlm_model.initialize()
bert_mlm_model.hybridize()
contextual_embedding, pooled_out, mlm_score = bert_mlm_model(inputs, token_types,
valid_length, masked_positions)
bert_mlm_model_tn = BertForMLM(cfg_tn)
bert_mlm_model_tn.share_parameters(bert_mlm_model.collect_params())
bert_mlm_model_tn.hybridize()
contextual_embedding_tn, pooled_out_tn, mlm_score_tn =\
bert_mlm_model_tn(inputs.T, token_types.T, valid_length, masked_positions)
assert_allclose(contextual_embedding.asnumpy(),
mx.np.swapaxes(contextual_embedding_tn, 0, 1).asnumpy(),
1E-4, 1E-4)
assert_allclose(pooled_out.asnumpy(), pooled_out_tn.asnumpy(), 1E-3, 1E-3)
assert_allclose(mlm_score.asnumpy(), mlm_score_tn.asnumpy(), 1E-3, 1E-3)
# Test for BertForPretrain
bert_pretrain_model = BertForPretrain(cfg)
bert_pretrain_model.initialize()
bert_pretrain_model.hybridize()
contextual_embedding, pooled_out, nsp_score, mlm_scores =\
bert_pretrain_model(inputs, token_types, valid_length, masked_positions)
bert_pretrain_model_tn = BertForPretrain(cfg_tn)
bert_pretrain_model_tn.share_parameters(bert_pretrain_model.collect_params())
bert_pretrain_model_tn.hybridize()
contextual_embedding_tn, pooled_out_tn, nsp_score_tn, mlm_scores_tn = \
bert_pretrain_model_tn(inputs.T, token_types.T, valid_length, masked_positions)
assert_allclose(contextual_embedding.asnumpy(),
mx.np.swapaxes(contextual_embedding_tn, 0, 1).asnumpy(),
1E-3, 1E-3)
assert_allclose(pooled_out.asnumpy(), pooled_out_tn.asnumpy(), 1E-3, 1E-3)
assert_allclose(nsp_score.asnumpy(), nsp_score_tn.asnumpy(), 1E-3, 1E-3)
assert_allclose(mlm_score.asnumpy(), mlm_score_tn.asnumpy(), 1E-3, 1E-3)
# Test BertModel FP16
device_type = ctx.device_type
if device_type == 'gpu':
verify_backbone_fp16(model_cls=BertModel, cfg=cfg, ctx=ctx,
inputs=[inputs, token_types, valid_length])