def main():
log.basicConfig(format="[ %(levelname)s ] %(message)s", level=log.INFO, stream=sys.stdout)
args = build_argparser().parse_args()
# load vocabulary file for model
log.info("Loading vocab file:\t{}".format(args.vocab))
vocab = load_vocab_file(args.vocab)
log.info("{} tokens loaded".format(len(vocab)))
# get context as a string (as we might need it's length for the sequence reshape)
paragraphs = get_paragraphs(args.input)
context = '\n'.join(paragraphs)
log.info("Size: {} chars".format(len(context)))
sentences = re.split(sentence_splitter, context)
preprocessed_sentences = [text_to_tokens(sentence, vocab) for sentence in sentences]
max_sent_length = max([len(tokens) + 2 for tokens, _ in preprocessed_sentences])
log.info("Initializing Inference Engine")
ie = IECore()
version = ie.get_versions(args.device)[args.device]
version_str = "{}.{}.{}".format(version.major, version.minor, version.build_number)
log.info("Plugin version is {}".format(version_str))
# read IR
model_xml = args.model
model_bin = model_xml.with_suffix(".bin")
log.info("Loading network files:\n\t{}\n\t{}".format(model_xml, model_bin))
ie_encoder = ie.read_network(model=model_xml, weights=model_bin)
# check input and output names
input_names = [i.strip() for i in args.input_names.split(',')]
if ie_encoder.input_info.keys() != set(input_names):
log.error("Input names do not match")
log.error(" The demo expects input names: {}. "
"Please use the --input_names to specify the right names "
"(see actual values below)".format(input_names))
log.error(" Actual network input names: {}".format(list(ie_encoder.input_info.keys())))
raise Exception("Unexpected network input names")
if len(ie_encoder.outputs) != 1:
log.log.error('Demo expects model with single output, while provided {}'.format(len(ie_encoder.outputs)))
raise Exception('Unexpected number of outputs')
output_names = list(ie_encoder.outputs)
max_length = ie_encoder.input_info[input_names[0]].input_data.shape[1]
if max_sent_length > max_length:
input_shapes = {
input_names[0]: [1, max_sent_length],
input_names[1]: [1, max_sent_length],
input_names[2]: [1, max_sent_length]
}
ie_encoder.reshape(input_shapes)
max_length = max_sent_length
# load model to the device
log.info("Loading model to the {}".format(args.device))
ie_encoder_exec = ie.load_network(network=ie_encoder, device_name=args.device)
# maximum number of tokens that can be processed by network at once
t0 = time.perf_counter()
t_count = 0
def get_score(name):
out = np.exp(res[name][0])
return out / out.sum(axis=-1, keepdims=True)
for sentence, (c_tokens_id, c_token_s_e) in zip(sentences, preprocessed_sentences):
# form the request
tok_cls = vocab['[CLS]']
tok_sep = vocab['[SEP]']
input_ids = [tok_cls] + c_tokens_id + [tok_sep]
token_type_ids = [0] * len(input_ids)
attention_mask = [1] * len(input_ids)
# pad the rest of the request
pad_len = max_length - len(input_ids)
input_ids += [0] * pad_len
token_type_ids += [0] * pad_len
attention_mask += [0] * pad_len
# create numpy inputs for IE
inputs = {
input_names[0]: np.array([input_ids], dtype=np.int32),
input_names[1]: np.array([attention_mask], dtype=np.int32),
input_names[2]: np.array([token_type_ids], dtype=np.int32),
}
if len(input_names)>3:
inputs[input_names[3]] = np.arange(len(input_ids), dtype=np.int32)[None, :]
t_start = time.perf_counter()
# infer by IE
res = ie_encoder_exec.infer(inputs=inputs)
t_end = time.perf_counter()
t_count += 1
log.info("Sequence of length {} is processed with {:0.2f} requests/sec ({:0.2} sec per request)".format(
max_length,
1 / (t_end - t_start),
t_end - t_start
))
score = get_score(output_names[0])
labels_idx = score.argmax(-1)
filtered_labels_idx = [
(idx, label_idx)
for idx, label_idx in enumerate(labels_idx)
if label_idx != 0 and 0 < idx < max_length - pad_len
]
if not filtered_labels_idx:
continue
log.info('Sentence: \n\t{}'.format(sentence))
visualized = set()
for idx, label_idx in filtered_labels_idx:
word_s, word_e = c_token_s_e[idx - 1]
if (word_s, word_e) in visualized:
continue
visualized.add((word_s, word_e))
word = sentence[word_s:word_e]
log.info('\n\tWord: {}\n\tConfidence: {}\n\tTag: {}'.format(word, score[idx][label_idx], label_to_tag[label_idx]))
t1 = time.perf_counter()
log.info("The performance below is reported only for reference purposes, "
"please use the benchmark_app tool (part of the OpenVINO samples) for any actual measurements.")
log.info("{} requests of {} length were processed in {:0.2f}sec ({:0.2}sec per request)".format(
t_count,
max_length,
t1 - t0,
(t1 - t0) / t_count
))
def encode_txt(txt):
if do_lower_case:
txt = txt.lower()
return tokens_bert.text_to_tokens(txt, vocab)
def main():
log.basicConfig(format="[ %(levelname)s ] %(message)s", level=log.INFO, stream=sys.stdout)
args = build_argparser().parse_args()
if args.colors:
COLOR_RED = "\033[91m"
COLOR_RESET = "\033[0m"
else:
COLOR_RED = ""
COLOR_RESET = ""
# load vocabulary file for model
log.info("Loading vocab file:\t{}".format(args.vocab))
vocab = load_vocab_file(args.vocab)
log.info("{} tokens loaded".format(len(vocab)))
# get context as a string (as we might need it's length for the sequence reshape)
paragraphs = get_paragraphs(args.input)
context = '\n'.join(paragraphs)
log.info("Size: {} chars".format(len(context)))
log.info("Context: " + COLOR_RED + context + COLOR_RESET)
# encode context into token ids list
c_tokens_id, c_tokens_se = text_to_tokens(context.lower(), vocab)
log.info("Initializing Inference Engine")
ie = IECore()
version = ie.get_versions(args.device)[args.device]
version_str = "{}.{}.{}".format(version.major, version.minor, version.build_number)
log.info("Plugin version is {}".format(version_str))
# read IR
model_xml = args.model
model_bin = model_xml.with_suffix(".bin")
log.info("Loading network files:\n\t{}\n\t{}".format(model_xml, model_bin))
ie_encoder = ie.read_network(model=model_xml, weights=model_bin)
if args.reshape:
# reshape the sequence length to the context + maximum question length (in tokens)
first_input_layer = next(iter(ie_encoder.input_info))
c = ie_encoder.input_info[first_input_layer].input_data.shape[1]
# find the closest multiple of 64, if it is smaller than current network's sequence length, let' use that
seq = min(c, int(np.ceil((len(c_tokens_id) + args.max_question_token_num) / 64) * 64))
if seq < c:
new_shapes = {}
for input_name, input_info in ie_encoder.input_info.items():
n, c = input_info.input_data.shape
new_shapes[input_name] = [n, seq]
log.info("Reshaped input {} from {} to the {}".format(
input_name, input_info.input_data.shape, new_shapes[input_name]))
log.info("Attempting to reshape the network to the modified inputs...")
try:
ie_encoder.reshape(new_shapes)
log.info("Successful!")
except RuntimeError:
log.error("Failed to reshape the network, please retry the demo without '-r' option")
sys.exit(-1)
else:
log.info("Skipping network reshaping,"
" as (context length + max question length) exceeds the current (input) network sequence length")
# check input and output names
input_names = [i.strip() for i in args.input_names.split(',')]
output_names = [o.strip() for o in args.output_names.split(',')]
if ie_encoder.input_info.keys() != set(input_names) or ie_encoder.outputs.keys() != set(output_names):
log.error("Input or Output names do not match")
log.error(" The demo expects input->output names: {}->{}. "
"Please use the --input_names and --output_names to specify the right names "
"(see actual values below)".format(input_names, output_names))
log.error(" Actual network input->output names: {}->{}".format(list(ie_encoder.input_info.keys()),
list(ie_encoder.outputs.keys())))
raise Exception("Unexpected network input or output names")
# load model to the device
log.info("Loading model to the {}".format(args.device))
ie_encoder_exec = ie.load_network(network=ie_encoder, device_name=args.device)
if args.questions:
def questions():
for question in args.questions:
log.info("Question: {}".format(question))
yield question
else:
def questions():
while True:
yield input('Type question (empty string to exit):')
# loop on user's or prepared questions
for question in questions():
if not question.strip():
break
q_tokens_id, _ = text_to_tokens(question.lower(), vocab)
# maximum number of tokens that can be processed by network at once
max_length = ie_encoder.input_info[input_names[0]].input_data.shape[1]
# calculate number of tokens for context in each inference request.
# reserve 3 positions for special tokens
# [CLS] q_tokens [SEP] c_tokens [SEP]
c_wnd_len = max_length - (len(q_tokens_id) + 3)
# token num between two neighbour context windows
# 1/2 means that context windows are overlapped by half
c_stride = c_wnd_len // 2
t0 = time.perf_counter()
t_count = 0
# array of answers from each window
answers = []
# init a window to iterate over context
c_s, c_e = 0, min(c_wnd_len, len(c_tokens_id))
# iterate while context window is not empty
while c_e > c_s:
# form the request
tok_cls = vocab['[CLS]']
tok_sep = vocab['[SEP]']
input_ids = [tok_cls] + q_tokens_id + [tok_sep] + c_tokens_id[c_s:c_e] + [tok_sep]
token_type_ids = [0] + [0] * len(q_tokens_id) + [0] + [1] * (c_e - c_s) + [0]
attention_mask = [1] * len(input_ids)
# pad the rest of the request
pad_len = max_length - len(input_ids)
input_ids += [0] * pad_len
token_type_ids += [0] * pad_len
attention_mask += [0] * pad_len
# create numpy inputs for IE
inputs = {
input_names[0]: np.array([input_ids], dtype=np.int32),
input_names[1]: np.array([attention_mask], dtype=np.int32),
input_names[2]: np.array([token_type_ids], dtype=np.int32),
}
if len(input_names)>3:
inputs[input_names[3]] = np.arange(len(input_ids), dtype=np.int32)[None, :]
t_start = time.perf_counter()
# infer by IE
res = ie_encoder_exec.infer(inputs=inputs)
t_end = time.perf_counter()
t_count += 1
log.info("Sequence of length {} is processed with {:0.2f} requests/sec ({:0.2} sec per request)".format(
max_length,
1 / (t_end - t_start),
t_end - t_start
))
# get start-end scores for context
def get_score(name):
out = np.exp(res[name].reshape((max_length,)))
return out / out.sum(axis=-1)
score_s = get_score(output_names[0])
score_e = get_score(output_names[1])
# get 'no-answer' score (not valid if model has been fine-tuned on squad1.x)
if args.model_squad_ver.split('.')[0] == '1':
score_na = 0
else:
score_na = score_s[0] * score_e[0]
# find product of all start-end combinations to find the best one
c_s_idx = len(q_tokens_id) + 2 # index of first context token in tensor
c_e_idx = max_length - (1 + pad_len) # index of last+1 context token in tensor
score_mat = np.matmul(
score_s[c_s_idx:c_e_idx].reshape((c_e - c_s, 1)),
score_e[c_s_idx:c_e_idx].reshape((1, c_e - c_s))
)
# reset candidates with end before start
score_mat = np.triu(score_mat)
# reset long candidates (>max_answer_token_num)
score_mat = np.tril(score_mat, args.max_answer_token_num - 1)
# find the best start-end pair
max_s, max_e = divmod(score_mat.flatten().argmax(), score_mat.shape[1])
max_score = score_mat[max_s, max_e] * (1 - score_na)
# convert to context text start-end index
max_s = c_tokens_se[c_s + max_s][0]
max_e = c_tokens_se[c_s + max_e][1]
# check that answers list does not have duplicates (because of context windows overlapping)
same = [i for i, a in enumerate(answers) if a[1] == max_s and a[2] == max_e]
if same:
assert len(same) == 1
# update existing answer record
a = answers[same[0]]
answers[same[0]] = (max(max_score, a[0]), max_s, max_e)
else:
# add new record
answers.append((max_score, max_s, max_e))
# check that context window reached the end
if c_e == len(c_tokens_id):
break
# move to next window position
c_s = min(c_s + c_stride, len(c_tokens_id))
c_e = min(c_s + c_wnd_len, len(c_tokens_id))
t1 = time.perf_counter()
log.info("The performance below is reported only for reference purposes, "
"please use the benchmark_app tool (part of the OpenVINO samples) for any actual measurements.")
log.info("{} requests of {} length were processed in {:0.2f}sec ({:0.2}sec per request)".format(
t_count,
max_length,
t1 - t0,
(t1 - t0) / t_count
))
# print top 3 results
answers = sorted(answers, key=lambda x: -x[0])
for score, s, e in answers[:3]:
log.info("---answer: {:0.2f} {}".format(score, context[s:e]))
c_s, c_e = find_sentence_range(context, s, e)
log.info(" " + context[c_s:s] + COLOR_RED + context[s:e] + COLOR_RESET + context[e:c_e])
def main():
log.basicConfig(format="[ %(levelname)s ] %(message)s", level=log.INFO, stream=sys.stdout)
args = build_argparser().parse_args()
log.info("Creating Inference Engine")
ie = IECore()
#read model to calculate embedding
model_xml_emb = args.model_emb
model_bin_emb = model_xml_emb.with_suffix(".bin")
log.info("Loading embedding network files:\n\t{}\n\t{}".format(model_xml_emb, model_bin_emb))
ie_encoder_emb = ie.read_network(model=model_xml_emb, weights=model_bin_emb)
input_names_model_emb = list(ie_encoder_emb.input_info.keys())
input_names_emb = args.input_names_emb.split(',')
log.info("Expected embedding input names: {}".format(input_names_emb))
log.info("Network embedding input names: {}".format(input_names_model_emb))
# check input names
if set(input_names_model_emb) != set(input_names_emb):
log.error("Unexpected embedding network input names")
raise Exception("Unexpected embedding network input names")
# check outputs
output_names_model_emb = list(ie_encoder_emb.outputs.keys())
if len(output_names_model_emb)>1:
log.error("Expected only single output in embedding network but {} outputs detected".format(output_names_model_emb))
raise Exception("Unexpected number of embedding network outputs")
#reshape embedding model to infer short questions and long contexts
ie_encoder_exec_emb_dict = {}
max_length_c = 384
max_length_q = 32
for length in [max_length_q, max_length_c]:
new_shapes = {}
for i, input_info in ie_encoder_emb.input_info.items():
new_shapes[i] = [1, length]
log.info("Reshaped input {} from {} to the {}".format(
i,
input_info.input_data.shape,
new_shapes[i]))
log.info("Attempting to reshape the context embedding network to the modified inputs...")
try:
ie_encoder_emb.reshape(new_shapes)
log.info("Successful!")
except RuntimeError:
log.error("Failed to reshape the embedding network")
raise
# Loading model to the plugin
log.info("Loading model to the plugin")
ie_encoder_exec_emb_dict[length] = ie.load_network(network=ie_encoder_emb, device_name=args.device)
# Read model for final exact qa
if args.model_qa:
model_xml = args.model_qa
model_bin = model_xml.with_suffix(".bin")
log.info("Loading network files:\n\t{}\n\t{}".format(model_xml, model_bin))
ie_encoder_qa = ie.read_network(model=model_xml, weights=model_bin)
ie_encoder_qa.batch_size = 1
input_names_qa = args.input_names_qa.split(',')
output_names_qa = args.output_names_qa.split(',')
log.info("Expected input->output names: {}->{}".format(input_names_qa, output_names_qa))
#check input and output names
input_names_model_qa = list(ie_encoder_qa.input_info.keys())
output_names_model_qa = list(ie_encoder_qa.outputs.keys())
log.info("Network input->output names: {}->{}".format(input_names_model_qa, output_names_model_qa))
if set(input_names_model_qa) != set(input_names_qa) or set(output_names_model_qa) != set(output_names_qa):
log.error("Unexpected network input or output names")
raise Exception("Unexpected network input or output names")
# Loading model to the plugin
log.info("Loading model to the plugin")
ie_encoder_qa_exec = ie.load_network(network=ie_encoder_qa, device_name=args.device)
max_length_qc = ie_encoder_qa.input_info[input_names_qa[0]].input_data.shape[1]
#load vocabulary file for all models
log.info("Loading vocab file:\t{}".format(args.vocab))
vocab = load_vocab_file(args.vocab)
log.info("{} tokens loaded".format(len(vocab)))
#define function to infer embedding
def calc_emb(tokens_id, max_length):
num = min(max_length - 2, len(tokens_id))
# forms the request
pad_len = max_length - num - 2
tok_cls = [vocab['[CLS]']]
tok_sep = [vocab['[SEP]']]
tok_pad = [vocab['[PAD]']]
dtype = np.int32
inputs = {
input_names_emb[0]: np.array([tok_cls + tokens_id[:num] + tok_sep + tok_pad * pad_len], dtype=dtype),
input_names_emb[1]: np.array([[1] + [1] * num + [1] + [0] * pad_len], dtype=dtype),
input_names_emb[2]: np.array([[0] + [0] * num + [0] + tok_pad * pad_len], dtype=dtype),
input_names_emb[3]: np.arange(max_length, dtype=dtype)[None, :]
}
# calc embedding
ie_encoder_exec_emb = ie_encoder_exec_emb_dict[max_length]
t_start = time.perf_counter()
res = ie_encoder_exec_emb.infer(inputs=inputs)
t_end = time.perf_counter()
log.info("embedding calculated for sequence of length {} with {:0.2f} requests/sec ({:0.2} sec per request)".format(
max_length,
1 / (t_end - t_start),
t_end - t_start
))
res = res[output_names_model_emb[0]]
return res.squeeze(0)
#small class to store context as text and tokens and its embedding vector
class ContextData:
def __init__(self, context, c_tokens_id, c_tokens_se):
self.context = context
self.c_tokens_id = c_tokens_id
self.c_tokens_se = c_tokens_se
self.c_emb = calc_emb(self.c_tokens_id, max_length_c)
paragraphs = get_paragraphs(args.input)
contexts_all = []
log.info("Indexing {} paragraphs...".format(len(paragraphs)))
for par in paragraphs:
c_tokens_id, c_tokens_se = text_to_tokens(par.lower(), vocab)
if not c_tokens_id:
continue
# get context as string and then encode it into token id list
# calculate number of tokens for context in each request.
# reserve 3 positions for special tokens
# [CLS] q_tokens [SEP] c_tokens [SEP]
if args.model_qa:
#to make context be able to pass model_qa together with question
c_wnd_len = max_length_qc - (max_length_q + 3)
else:
#to make context be able to pass model_emb without question
c_wnd_len = max_length_c - 2
# token num between 2 neighbours context windows
# 1/2 means that context windows are interleaved by half
c_stride = c_wnd_len // 2
# init scan window
c_s, c_e = 0, min(c_wnd_len, len(c_tokens_id))
# iterate while context window is not empty
while c_e > c_s:
contexts_all.append(ContextData(par, c_tokens_id[c_s:c_e], c_tokens_se[c_s:c_e]))
# check that context window reach the end
if c_e == len(c_tokens_id):
break
# move to next window position
c_s, c_e = c_s+c_stride, c_e+c_stride
shift_left = max(0, c_e - len(c_tokens_id))
c_s, c_e = c_s -shift_left, c_e-shift_left
assert c_s >= 0, "start can be left of 0 only with window less than len but in this case we can not be here"
if args.questions:
def questions():
for question in args.questions:
log.info("Question: {}".format(question))
yield question
else:
def questions():
while True:
yield input('Type question (empty string to exit):')
# loop on user's or prepared questions
for question in questions():
if not question.strip():
break
log.info("---Stage 1---Calc question embedding and compare with {} context embeddings".format(len(contexts_all)))
q_tokens_id, _ = text_to_tokens(question.lower(), vocab)
q_emb = calc_emb(q_tokens_id, max_length_q)
distances = [(np.linalg.norm(c.c_emb - q_emb, 2), c) for c in contexts_all]
distances.sort(key=lambda x: x[0])
keep_num = min(args.best_n, len(distances))
distances_filtered = distances[:keep_num]
#print short list
print("The closest contexts to question:")
for i, (dist, c_data) in enumerate(distances_filtered):
print("#{}: embedding distance {} for context '{}'".format(i + 1, dist, c_data.context))
#run model_qa if available to find exact answer to question in filtered in contexts
if args.model_qa:
log.info("---Stage 2---Looking for exact answers in {} contexts filtered in from {}".format(keep_num, len(distances)))
# array of answers from each context_data
answers = []
for dist, c_data in distances_filtered:
#forms the request
tok_cls = [vocab['[CLS]']]
tok_sep = [vocab['[SEP]']]
tok_pad = [vocab['[PAD]']]
req_len = len(q_tokens_id) + len(c_data.c_tokens_id) + 3
pad_len = max_length_qc - req_len
assert pad_len >= 0
input_ids = tok_cls + q_tokens_id + tok_sep + c_data.c_tokens_id + tok_sep + tok_pad*pad_len
token_type_ids = [0] * (len(q_tokens_id)+2) + [1] * (len(c_data.c_tokens_id)+1) + tok_pad * pad_len
attention_mask = [1] * req_len + [0] * pad_len
#create numpy inputs for IE
inputs = {
input_names_qa[0]: np.array([input_ids], dtype=np.int32),
input_names_qa[1]: np.array([attention_mask], dtype=np.int32),
input_names_qa[2]: np.array([token_type_ids], dtype=np.int32),
}
if len(input_names_qa) > 3:
inputs['position_ids'] = np.arange(max_length_qc, dtype=np.int32)[None, :]
#infer by IE
t_start = time.perf_counter()
res = ie_encoder_qa_exec.infer(inputs=inputs)
t_end = time.perf_counter()
log.info(
"Exact answer calculated for sequence of length {} with {:0.2f} requests/sec ({:0.2} sec per request)".format(
max_length_qc,
1 / (t_end - t_start),
t_end - t_start
))
#get start-end scores for context
def get_score(name):
out = np.exp(res[name].reshape((max_length_qc, )))
return out / out.sum(axis=-1)
score_s = get_score(output_names_qa[0])
score_e = get_score(output_names_qa[1])
# find product of all start-end combinations to find the best one
c_s_idx = len(q_tokens_id) + 2 # index of first context token in tensor
c_e_idx = max_length_qc-(1+pad_len) # index of last+1 context token in tensor
score_mat = np.matmul(
score_s[c_s_idx:c_e_idx].reshape((len(c_data.c_tokens_id), 1)),
score_e[c_s_idx:c_e_idx].reshape((1, len(c_data.c_tokens_id)))
)
# reset candidates with end before start
score_mat = np.triu(score_mat)
# reset long candidates (>max_answer_token_num)
score_mat = np.tril(score_mat, args.max_answer_token_num - 1)
# find the best start-end pair
max_s, max_e = divmod(score_mat.flatten().argmax(), score_mat.shape[1])
max_score = score_mat[max_s, max_e]
# convert to context text start-end index
max_s = c_data.c_tokens_se[max_s][0]
max_e = c_data.c_tokens_se[max_e][1]
# check that answers list does not have answer yet
# it could be because of context windows overlapping
same = [i for i, a in enumerate(answers) if a[1] == max_s and a[2]==max_e and a[3] is c_data.context]
if same:
assert len(same) == 1
#update exist answer record
a = answers[same[0]]
answers[same[0]] = (max(max_score, a[0]), max_s, max_e, c_data.context)
else:
#add new record
answers.append((max_score, max_s, max_e, c_data.context))
def mark(txt):
return "\033[91m" + txt + "\033[0m" if args.colors else "*" + txt + "*"
#print top 3 results
answers.sort(key=lambda x: -x[0])
log.info("---Stage 3---Find best 3 answers from {} results of Stage 1".format(len(answers)))
for score, s, e, context in answers[:3]:
print("Answer (score: {:0.2f}): {}".format(score, mark(context[s:e])))
print(context[:s] + mark(context[s:e]) + context[e:])
def setup(url):
global vocab
global ie_encoder
global input_names
global output_names
global model
global c_tokens_id
global ie_encoder_exec
global args
global c_tokens_se
global context
global COLOR_RED
global COLOR_RESET
log.basicConfig(format="[ %(levelname)s ] %(message)s", level=log.INFO, stream=sys.stdout)
args = build_argparser().parse_args()
if args.colors:
COLOR_RED = "\033[91m"
COLOR_RESET = "\033[0m"
else:
COLOR_RED = ""
COLOR_RESET = ""
# load vocabulary file for model
log.info("Loading vocab file:\t{}".format(args.vocab))
vocab = load_vocab_file(args.vocab)
log.info("{} tokens loaded".format(len(vocab)))
# get context as a string (as we might need it's length for the sequence reshape)
p = url
paragraphs = get_paragraphs([p])
context = '\n'.join(paragraphs)
log.info("Size: {} chars".format(len(context)))
log.info("Context: " + COLOR_RED + context + COLOR_RESET)
# encode context into token ids list
c_tokens_id, c_tokens_se = text_to_tokens(context.lower(), vocab)
log.info("Initializing Inference Engine")
ie = IECore()
version = ie.get_versions(args.device)[args.device]
version_str = "{}.{}.{}".format(version.major, version.minor, version.build_number)
log.info("Plugin version is {}".format(version_str))
# read IR
model_xml = args.model
model_bin = model_xml.with_suffix(".bin")
log.info("Loading network files:\n\t{}\n\t{}".format(model_xml, model_bin))
ie_encoder = ie.read_network(model=model_xml, weights=model_bin)
if args.reshape:
# reshape the sequence length to the context + maximum question length (in tokens)
first_input_layer = next(iter(ie_encoder.inputs))
c = ie_encoder.inputs[first_input_layer].shape[1]
# find the closest multiple of 64, if it is smaller than current network's sequence length, let' use that
seq = min(c, int(np.ceil((len(c_tokens_id) + args.max_question_token_num) / 64) * 64))
if seq < c:
input_info = list(ie_encoder.inputs)
new_shapes = dict([])
for i in input_info:
n, c = ie_encoder.inputs[i].shape
new_shapes[i] = [n, seq]
log.info("Reshaped input {} from {} to the {}".format(i, ie_encoder.inputs[i].shape, new_shapes[i]))
log.info("Attempting to reshape the network to the modified inputs...")
try:
ie_encoder.reshape(new_shapes)
log.info("Successful!")
except RuntimeError:
log.error("Failed to reshape the network, please retry the demo without '-r' option")
sys.exit(-1)
else:
log.info("Skipping network reshaping,"
" as (context length + max question length) exceeds the current (input) network sequence length")
# check input and output names
input_names = list(i.strip() for i in args.input_names.split(','))
output_names = list(o.strip() for o in args.output_names.split(','))
if ie_encoder.inputs.keys() != set(input_names) or ie_encoder.outputs.keys() != set(output_names):
log.error("Input or Output names do not match")
log.error(" The demo expects input->output names: {}->{}. "
"Please use the --input_names and --output_names to specify the right names "
"(see actual values below)".format(input_names, output_names))
log.error(" Actual network input->output names: {}->{}".format(list(ie_encoder.inputs.keys()),
list(ie_encoder.outputs.keys())))
log.error(" Actual network input->output values: {}->{}".format(list(ie_encoder.inputs.values()),
list(ie_encoder.outputs.values())))
raise Exception("Unexpected network input or output names")
# load model to the device
log.info("Loading model to the {}".format(args.device))
ie_encoder_exec = ie.load_network(network=ie_encoder, device_name=args.device)
def update_output_div(n_clicks, input_value):
# loop on user's or prepared questions
for question in [input_value]:
if not question.strip():
break
q_tokens_id, _ = text_to_tokens(question.lower(), vocab)
# maximum number of tokens that can be processed by network at once
max_length = ie_encoder.inputs[input_names[0]].shape[1]
# calculate number of tokens for context in each inference request.
# reserve 3 positions for special tokens
# [CLS] q_tokens [SEP] c_tokens [SEP]
c_wnd_len = max_length - (len(q_tokens_id) + 3)
# token num between two neighbour context windows
# 1/2 means that context windows are overlapped by half
c_stride = c_wnd_len // 2
t0 = time.perf_counter()
t_count = 0
# array of answers from each window
answers = []
# init a window to iterate over context
c_s, c_e = 0, min(c_wnd_len, len(c_tokens_id))
# iterate while context window is not empty
while c_e > c_s:
# form the request
tok_cls = vocab['[CLS]']
tok_sep = vocab['[SEP]']
input_ids = [tok_cls] + q_tokens_id + [
tok_sep
] + c_tokens_id[c_s:c_e] + [tok_sep]
token_type_ids = [0] + [0] * len(q_tokens_id) + [
0
] + [1] * (c_e - c_s) + [0]
attention_mask = [1] * len(input_ids)
# pad the rest of the request
pad_len = max_length - len(input_ids)
input_ids += [0] * pad_len
token_type_ids += [0] * pad_len
attention_mask += [0] * pad_len
# create numpy inputs for IE
inputs = {
input_names[0]: np.array([input_ids], dtype=np.int32),
input_names[1]: np.array([attention_mask], dtype=np.int32),
input_names[2]: np.array([token_type_ids], dtype=np.int32),
}
if len(input_names) > 3:
inputs[input_names[3]] = np.arange(len(input_ids),
dtype=np.int32)[None, :]
t_start = time.perf_counter()
# infer by IE
res = ie_encoder_exec.infer(inputs=inputs)
t_end = time.perf_counter()
t_count += 1
log.info(
"Sequence of length {} is processed with {:0.2f} requests/sec ({:0.2} sec per request)"
.format(max_length, 1 / (t_end - t_start), t_end - t_start))
# get start-end scores for context
def get_score(name):
out = np.exp(res[name].reshape((max_length, )))
return out / out.sum(axis=-1)
score_s = get_score(output_names[0])
score_e = get_score(output_names[1])
# get 'no-answer' score (not valid if model has been fine-tuned on squad1.x)
if args.model_squad_ver.split('.')[0] == '1':
score_na = 0
else:
score_na = score_s[0] * score_e[0]
# find product of all start-end combinations to find the best one
c_s_idx = len(
q_tokens_id) + 2 # index of first context token in tensor
c_e_idx = max_length - (
1 + pad_len) # index of last+1 context token in tensor
score_mat = np.matmul(
score_s[c_s_idx:c_e_idx].reshape((c_e - c_s, 1)),
score_e[c_s_idx:c_e_idx].reshape((1, c_e - c_s)))
# reset candidates with end before start
score_mat = np.triu(score_mat)
# reset long candidates (>max_answer_token_num)
score_mat = np.tril(score_mat, args.max_answer_token_num - 1)
# find the best start-end pair
max_s, max_e = divmod(score_mat.flatten().argmax(),
score_mat.shape[1])
max_score = score_mat[max_s, max_e] * (1 - score_na)
# convert to context text start-end index
max_s = c_tokens_se[c_s + max_s][0]
max_e = c_tokens_se[c_s + max_e][1]
# check that answers list does not have duplicates (because of context windows overlapping)
same = [
i for i, a in enumerate(answers)
if a[1] == max_s and a[2] == max_e
]
if same:
assert len(same) == 1
# update existing answer record
a = answers[same[0]]
answers[same[0]] = (max(max_score, a[0]), max_s, max_e)
else:
# add new record
answers.append((max_score, max_s, max_e))
# check that context window reached the end
if c_e == len(c_tokens_id):
break
# move to next window position
c_s = min(c_s + c_stride, len(c_tokens_id))
c_e = min(c_s + c_wnd_len, len(c_tokens_id))
t1 = time.perf_counter()
log.info(
"The performance below is reported only for reference purposes, "
"please use the benchmark_app tool (part of the OpenVINO samples) for any actual measurements."
)
log.info(
"{} requests of {} length were processed in {:0.2f}sec ({:0.2}sec per request)"
.format(t_count, max_length, t1 - t0, (t1 - t0) / t_count))
# print top 3 results
answers = sorted(answers, key=lambda x: -x[0])
for score, s, e in answers[:3]:
resp = "Answer: {}".format(context[s:e]) + "\n"
#cont = context[c_s:s] + COLOR_RED + context[s:e] + COLOR_RESET + context[e:c_e]
cont = "Can I answer any other Questions? "
log.info("---answer: {:0.2f} {}".format(score, context[s:e]))
c_s, c_e = find_sentence_range(context, s, e)
log.info(" " + context[c_s:s] + COLOR_RED + context[s:e] +
COLOR_RESET + context[e:c_e])
return resp
COLOR_RESET = ""
# load vocabulary file for model
log.info("Loading vocab file:\t{}".format(args.vocab))
vocab = load_vocab_file(args.vocab)
log.info("{} tokens loaded".format(len(vocab)))
# get context as a string (as we might need it's length for the sequence reshape)
p = url
paragraphs = get_paragraphs([p])
context = '\n'.join(paragraphs)
log.info("Size: {} chars".format(len(context)))
log.info("Context: " + COLOR_RED + context + COLOR_RESET)
# encode context into token ids list
c_tokens_id, c_tokens_se = text_to_tokens(context.lower(), vocab)
log.info("Initializing Inference Engine")
ie = IECore()
version = ie.get_versions(args.device)[args.device]
version_str = "{}.{}.{}".format(version.major, version.minor,
version.build_number)
log.info("Plugin version is {}".format(version_str))
# read IR
model_xml = args.model
model_bin = model_xml.with_suffix(".bin")
log.info("Loading network files:\n\t{}\n\t{}".format(model_xml, model_bin))
ie_encoder = ie.read_network(model=model_xml, weights=model_bin)