def check_save_and_load(self, config, pixel_values, encoder_hidden_states,
decoder_config, decoder_input_ids,
decoder_attention_mask, **kwargs):
encoder_model, decoder_model = self.get_encoder_decoder_model(
config, decoder_config)
kwargs = {
"encoder_model": encoder_model,
"decoder_model": decoder_model
}
enc_dec_model = FlaxVisionEncoderDecoderModel.from_encoder_decoder_pretrained(
**kwargs)
outputs = enc_dec_model(
pixel_values=pixel_values,
decoder_input_ids=decoder_input_ids,
decoder_attention_mask=decoder_attention_mask,
)
out_2 = np.array(outputs[0])
out_2[np.isnan(out_2)] = 0
with tempfile.TemporaryDirectory() as tmpdirname:
enc_dec_model.save_pretrained(tmpdirname)
FlaxVisionEncoderDecoderModel.from_pretrained(tmpdirname)
after_outputs = enc_dec_model(
pixel_values=pixel_values,
decoder_input_ids=decoder_input_ids,
decoder_attention_mask=decoder_attention_mask,
)
out_1 = np.array(after_outputs[0])
out_1[np.isnan(out_1)] = 0
max_diff = np.amax(np.abs(out_1 - out_2))
self.assertLessEqual(max_diff, 1e-5)
def test_real_model_save_load_from_pretrained(self):
model_2 = self.get_pretrained_model()
pixel_values = floats_tensor([
13,
model_2.config.encoder.num_channels,
model_2.config.encoder.image_size,
model_2.config.encoder.image_size,
])
decoder_input_ids = ids_tensor([13, 1],
model_2.config.decoder.vocab_size)
outputs = model_2(
pixel_values=pixel_values,
decoder_input_ids=decoder_input_ids,
)
out_2 = np.array(outputs[0])
out_2[np.isnan(out_2)] = 0
with tempfile.TemporaryDirectory() as tmp_dirname:
model_2.save_pretrained(tmp_dirname)
model_1 = FlaxVisionEncoderDecoderModel.from_pretrained(
tmp_dirname)
after_outputs = model_1(
pixel_values=pixel_values,
decoder_input_ids=decoder_input_ids,
)
out_1 = np.array(after_outputs[0])
out_1[np.isnan(out_1)] = 0
max_diff = np.amax(np.abs(out_1 - out_2))
self.assertLessEqual(max_diff, 1e-5)
def test_inference_coco_en(self):
loc = "ydshieh/vit-gpt2-coco-en"
feature_extractor = ViTFeatureExtractor.from_pretrained(loc)
tokenizer = AutoTokenizer.from_pretrained(loc)
model = FlaxVisionEncoderDecoderModel.from_pretrained(loc)
img = prepare_img()
pixel_values = feature_extractor(images=img,
return_tensors="np").pixel_values
decoder_input_ids = np.array([[model.config.decoder_start_token_id]])
logits = model(pixel_values, decoder_input_ids)[0]
logits = np.array(logits)
# verify the logits
expected_shape = (1, 1, model.config.decoder.vocab_size)
self.assertEqual(logits.shape, expected_shape)
EXPECTED_LOGIT_SLICE = np.array([
-38.705837,
-30.639936,
-31.41905,
-39.01204,
-38.38698,
-34.887215,
-33.29087,
-35.684475,
-38.50852,
-36.124676,
])
max_diff = np.amax(np.abs(logits[0, 0, :10] - EXPECTED_LOGIT_SLICE))
self.assertLessEqual(max_diff, 1e-4)
def generate_step(pixel_values):
outputs = model.generate(pixel_values, max_length=16, num_beams=4)
output_ids = outputs.sequences
preds = tokenizer.batch_decode(output_ids,
skip_special_tokens=True)
preds = [pred.strip() for pred in preds]
return preds, outputs.scores
preds, scores = generate_step(pixel_values)
EXPECTED_SCORES = np.array([-0.59563464])
scores = np.array(scores)
max_diff = np.amax(np.abs(scores - EXPECTED_SCORES))
self.assertLessEqual(max_diff, 1e-4)
# should produce
# ["a cat laying on top of a couch next to another cat"]
self.assertEqual(
preds, ["a cat laying on top of a couch next to another cat"])
def check_pt_flax_equivalence(self, pt_model, fx_model, inputs_dict):
pt_model.to(torch_device)
pt_model.eval()
# prepare inputs
flax_inputs = inputs_dict
pt_inputs = {
k: torch.tensor(v.tolist())
for k, v in flax_inputs.items()
}
with torch.no_grad():
pt_outputs = pt_model(**pt_inputs).to_tuple()
fx_outputs = fx_model(**inputs_dict).to_tuple()
self.assertEqual(len(fx_outputs), len(pt_outputs),
"Output lengths differ between Flax and PyTorch")
for fx_output, pt_output in zip(fx_outputs, pt_outputs):
self.assert_almost_equals(fx_output, pt_output.numpy(), 1e-5)
# PT -> Flax
with tempfile.TemporaryDirectory() as tmpdirname:
pt_model.save_pretrained(tmpdirname)
fx_model_loaded = FlaxVisionEncoderDecoderModel.from_pretrained(
tmpdirname, from_pt=True)
fx_outputs_loaded = fx_model_loaded(**inputs_dict).to_tuple()
self.assertEqual(len(fx_outputs_loaded), len(pt_outputs),
"Output lengths differ between Flax and PyTorch")
for fx_output_loaded, pt_output in zip(fx_outputs_loaded, pt_outputs):
self.assert_almost_equals(fx_output_loaded, pt_output.numpy(),
1e-5)
# Flax -> PT
with tempfile.TemporaryDirectory() as tmpdirname:
fx_model.save_pretrained(tmpdirname)
pt_model_loaded = VisionEncoderDecoderModel.from_pretrained(
tmpdirname, from_flax=True)
pt_model_loaded.to(torch_device)
pt_model_loaded.eval()
with torch.no_grad():
pt_outputs_loaded = pt_model_loaded(**pt_inputs).to_tuple()
self.assertEqual(len(fx_outputs), len(pt_outputs_loaded),
"Output lengths differ between Flax and PyTorch")
for fx_output, pt_output_loaded in zip(fx_outputs, pt_outputs_loaded):
self.assert_almost_equals(fx_output, pt_output_loaded.numpy(),
1e-5)