Implement mkldnn convolution fusion and quantization.

Makefile

@@ -66,8 +66,8 @@ $(warning "USE_MKL2017 is deprecated. We will switch to USE_MKLDNN.")
 endif
 
 ifeq ($(USE_MKLDNN), 1)
-	MKLDNNROOT = $(ROOTDIR)/3rdparty/mkldnn/install
-	MKLROOT = $(ROOTDIR)/3rdparty/mkldnn/install
+	MKLDNNROOT = $(ROOTDIR)/3rdparty/mkldnn/build/install
+	MKLROOT = $(ROOTDIR)/3rdparty/mkldnn/build/install
 	export USE_MKLML = 1
 endif
 

example/quantization/imagenet_gen_qsym.py

@@ -92,7 +92,7 @@ def save_params(fname, arg_params, aux_params, logger=None):
                              ' thresholds. This mode is expected to produce the best inference accuracy of all three'
                              ' kinds of quantized models if the calibration dataset is representative enough of the'
                              ' inference dataset.')
-    parser.add_argument('--quantized-dtype', type=str, default='int8', 
+    parser.add_argument('--quantized-dtype', type=str, default='int8',
                         choices=['int8', 'uint8'],
                         help='quantization destination data type for input data')
     args = parser.parse_args()

example/quantization/imagenet_gen_qsym_mkldnn.py

@@ -0,0 +1,207 @@
+# Licensed to the Apache Software Foundation (ASF) under one
+# or more contributor license agreements.  See the NOTICE file
+# distributed with this work for additional information
+# regarding copyright ownership.  The ASF licenses this file
+# to you under the Apache License, Version 2.0 (the
+# "License"); you may not use this file except in compliance
+# with the License.  You may obtain a copy of the License at
+#
+#   http://www.apache.org/licenses/LICENSE-2.0
+#
+# Unless required by applicable law or agreed to in writing,
+# software distributed under the License is distributed on an
+# "AS IS" BASIS, WITHOUT WARRANTIES OR CONDITIONS OF ANY
+# KIND, either express or implied.  See the License for the
+# specific language governing permissions and limitations
+# under the License.
+
+import argparse
+import os
+import logging
+from common import modelzoo
+import mxnet as mx
+from mxnet.contrib.quantization import *
+from mxnet.base import SymbolHandle, check_call, _LIB, mx_uint, c_str_array
+import ctypes
+
+
+def download_calib_dataset(dataset_url, calib_dataset, logger=None):
+    if logger is not None:
+        logger.info('Downloading calibration dataset from %s to %s' % (dataset_url, calib_dataset))
+    mx.test_utils.download(dataset_url, calib_dataset)
+
+
+def download_model(model_name, logger=None):
+    dir_path = os.path.dirname(os.path.realpath(__file__))
+    model_path = os.path.join(dir_path, 'model')
+    if logger is not None:
+        logger.info('Downloading model %s... into path %s' % (model_name, model_path))
+    return modelzoo.download_model(args.model, os.path.join(dir_path, 'model'))
+
+
+def save_symbol(fname, sym, logger=None):
+    if logger is not None:
+        logger.info('Saving symbol into file at %s' % fname)
+    sym.save(fname)
+
+
+def save_params(fname, arg_params, aux_params, logger=None):
+    if logger is not None:
+        logger.info('Saving params into file at %s' % fname)
+    save_dict = {('arg:%s' % k): v.as_in_context(cpu()) for k, v in arg_params.items()}
+    save_dict.update({('aux:%s' % k): v.as_in_context(cpu()) for k, v in aux_params.items()})
+    mx.nd.save(fname, save_dict)
+
+
+if __name__ == '__main__':
+    parser = argparse.ArgumentParser(description='Generate a calibrated quantized model from a FP32 model with MKL-DNN support')
+    parser.add_argument('--model', type=str, choices=['imagenet1k-resnet-152', 'imagenet1k-inception-bn'],
+                        help='currently only supports imagenet1k-resnet-152 or imagenet1k-inception-bn')
+    parser.add_argument('--batch-size', type=int, default=32)
+    parser.add_argument('--label-name', type=str, default='softmax_label')
+    parser.add_argument('--calib-dataset', type=str, default='data/val_256_q90.rec',
+                        help='path of the calibration dataset')
+    parser.add_argument('--image-shape', type=str, default='3,224,224')
+    parser.add_argument('--data-nthreads', type=int, default=60,
+                        help='number of threads for data decoding')
+    parser.add_argument('--num-calib-batches', type=int, default=10,
+                        help='number of batches for calibration')
+    parser.add_argument('--exclude-first-conv', action='store_true', default=True,
+                        help='excluding quantizing the first conv layer since the'
+                             ' input data may have negative value which doesn\'t support at moment' )
+    parser.add_argument('--shuffle-dataset', action='store_true', default=True,
+                        help='shuffle the calibration dataset')
+    parser.add_argument('--shuffle-chunk-seed', type=int, default=3982304,
+                        help='shuffling chunk seed, see'
+                             ' https://mxnet.incubator.apache.org/api/python/io/io.html?highlight=imager#mxnet.io.ImageRecordIter'
+                             ' for more details')
+    parser.add_argument('--shuffle-seed', type=int, default=48564309,
+                        help='shuffling seed, see'
+                             ' https://mxnet.incubator.apache.org/api/python/io/io.html?highlight=imager#mxnet.io.ImageRecordIter'
+                             ' for more details')
+    parser.add_argument('--calib-mode', type=str, default='entropy',
+                        help='calibration mode used for generating calibration table for the quantized symbol; supports'
+                             ' 1. none: no calibration will be used. The thresholds for quantization will be calculated'
+                             ' on the fly. This will result in inference speed slowdown and loss of accuracy'
+                             ' in general.'
+                             ' 2. naive: simply take min and max values of layer outputs as thresholds for'
+                             ' quantization. In general, the inference accuracy worsens with more examples used in'
+                             ' calibration. It is recommended to use `entropy` mode as it produces more accurate'
+                             ' inference results.'
+                             ' 3. entropy: calculate KL divergence of the fp32 output and quantized output for optimal'
+                             ' thresholds. This mode is expected to produce the best inference accuracy of all three'
+                             ' kinds of quantized models if the calibration dataset is representative enough of the'
+                             ' inference dataset.')
+    parser.add_argument('--quantized-dtype', type=str, default='uint8',
+                        choices=['int8', 'uint8'],
+                        help='quantization destination data type for input data')
+    parser.add_argument('--enable-calib-quantize', type=bool, default=True,
+                        help='If enabled, the quantize op will '
+                             'be calibrated offline if calibration mode is '
+                             'enabled')
+    args = parser.parse_args()
+    ctx = mx.cpu(0)
+    logging.basicConfig()
+    logger = logging.getLogger('logger')
+    logger.setLevel(logging.INFO)
+
+    logger.info('shuffle_dataset=%s' % args.shuffle_dataset)
+
+    calib_mode = args.calib_mode
+    logger.info('calibration mode set to %s' % calib_mode)
+
+    # download calibration dataset
+    if calib_mode != 'none':
+        download_calib_dataset('http://data.mxnet.io/data/val_256_q90.rec', args.calib_dataset)
+
+    # download model
+    prefix, epoch = download_model(model_name=args.model, logger=logger)
+    sym, arg_params, aux_params = mx.model.load_checkpoint(prefix, epoch)
+
+    sym = sym.get_backend_symbol('MKLDNN')
+
+    # get batch size
+    batch_size = args.batch_size
+    logger.info('batch size = %d for calibration' % batch_size)
+
+    # get number of batches for calibration
+    num_calib_batches = args.num_calib_batches
+    if calib_mode == 'none':
+        logger.info('skip calibration step as calib_mode is none')
+    else:
+        logger.info('number of batches = %d for calibration' % num_calib_batches)
+
+    # get number of threads for decoding the dataset
+    data_nthreads = args.data_nthreads
+
+    # get image shape
+    image_shape = args.image_shape
+
+    exclude_first_conv = args.exclude_first_conv
+    excluded_sym_names = []
+    if args.model == 'imagenet1k-resnet-152':
+        rgb_mean = '0,0,0'
+        calib_layer = lambda name: name.endswith('_output')
+        excluded_sym_names += ['flatten0', 'fc1']
+        if exclude_first_conv:
+            excluded_sym_names += ['conv0', 'pooling0']
+    elif args.model == 'imagenet1k-inception-bn':
+        rgb_mean = '123.68,116.779,103.939'
+        calib_layer = lambda name: name.endswith('_output')
+        excluded_sym_names += ['flatten', 'fc1']
+        if exclude_first_conv:
+            excluded_sym_names += ['conv_1']
+    else:
+        raise ValueError('model %s is not supported in this script' % args.model)
+
+    label_name = args.label_name
+    logger.info('label_name = %s' % label_name)
+
+    data_shape = tuple([int(i) for i in image_shape.split(',')])
+    logger.info('Input data shape = %s' % str(data_shape))
+
+    logger.info('rgb_mean = %s' % rgb_mean)
+    rgb_mean = [float(i) for i in rgb_mean.split(',')]
+    mean_args = {'mean_r': rgb_mean[0], 'mean_g': rgb_mean[1], 'mean_b': rgb_mean[2]}
+
+    if calib_mode == 'none':
+        logger.info('Quantizing FP32 model %s' % args.model)
+        qsym, qarg_params, aux_params = quantize_model(sym=sym, arg_params=arg_params, aux_params=aux_params,
+                                                       ctx=ctx, excluded_sym_names=excluded_sym_names,
+                                                       calib_mode=calib_mode, quantized_dtype=args.quantized_dtype,
+                                                       logger=logger)
+        sym_name = '%s-symbol.json' % (prefix + '-quantized')
+    else:
+        logger.info('Creating ImageRecordIter for reading calibration dataset')
+        data = mx.io.ImageRecordIter(path_imgrec=args.calib_dataset,
+                                     label_width=1,
+                                     preprocess_threads=data_nthreads,
+                                     batch_size=batch_size,
+                                     data_shape=data_shape,
+                                     label_name=label_name,
+                                     rand_crop=False,
+                                     rand_mirror=False,
+                                     shuffle=args.shuffle_dataset,
+                                     shuffle_chunk_seed=args.shuffle_chunk_seed,
+                                     seed=args.shuffle_seed,
+                                     **mean_args)
+
+        qsym, qarg_params, aux_params = quantize_model(sym=sym, arg_params=arg_params, aux_params=aux_params,
+                                                        ctx=ctx, excluded_sym_names=excluded_sym_names,
+                                                        calib_mode=calib_mode, calib_data=data,
+                                                        num_calib_examples=num_calib_batches * batch_size,
+                                                        calib_layer=calib_layer, quantized_dtype=args.quantized_dtype,
+                                                        label_names=(label_name,), calib_quantize_op = True,
+                                                        logger=logger)
+        if calib_mode == 'entropy':
+            suffix = '-quantized-%dbatches-entropy' % num_calib_batches
+        elif calib_mode == 'naive':
+            suffix = '-quantized-%dbatches-naive' % num_calib_batches
+        else:
+            raise ValueError('unknow calibration mode %s received, only supports `none`, `naive`, and `entropy`'
+                             % calib_mode)
+        sym_name = '%s-symbol.json' % (prefix + suffix)
+    qsym = qsym.get_backend_symbol('MKLDNN_POST_QUANTIZE')
+    save_symbol(sym_name, qsym, logger)
+    param_name = '%s-%04d.params' % (prefix + '-quantized', epoch)
+    save_params(param_name, qarg_params, aux_params, logger)

example/quantization/imagenet_inference.py

@@ -129,7 +129,7 @@ def score(sym, arg_params, aux_params, data, devs, label_name, max_num_examples,
         ctx = mx.cpu(0)
     else:
         raise ValueError('ctx %s is not supported in this script' % args.ctx)
-    
+
     logging.basicConfig()
     logger = logging.getLogger('logger')
     logger.setLevel(logging.INFO)

include/mxnet/c_api.h

@@ -1542,18 +1542,17 @@ MXNET_DLL int MXSymbolInferType(SymbolHandle sym,
  * \param sym_handle symbol to be converted
  * \param ret_sym_handle quantized symbol result
  * \param num_excluded_symbols number of layers excluded from being quantized in the input symbol
- * \param excluded_symbols array of symbols to be excluded from being quantized
+ * \param excluded_symbols op names to be excluded from being quantized
  * \param num_offline number of parameters that are quantized offline
  * \param offline_params array of c strings representing the names of params quantized offline
  * \param quantized_dtype the quantized destination type for input data.
+ * \param calib_quantize whether calibrate quantize op with offline calibration data.
  */
-MXNET_DLL int MXQuantizeSymbol(SymbolHandle sym_handle,
-                               SymbolHandle *ret_sym_handle,
+MXNET_DLL int MXQuantizeSymbol(SymbolHandle sym_handle, SymbolHandle *ret_sym_handle,
                                const mx_uint num_excluded_symbols,
-                               const SymbolHandle *excluded_symbols,
-                               const mx_uint num_offline,
-                               const char **offline_params,
-                               const char *quantized_dtype);
+                               const char **excluded_symbols,
+                               const mx_uint num_offline, const char **offline_params,
+                               const char *quantized_dtype, const bool calib_quantize);
 
 /*!
  * \brief Set calibration table to node attributes in the sym
@@ -1571,6 +1570,15 @@ MXNET_DLL int MXSetCalibTableToQuantizedSymbol(SymbolHandle qsym_handle,
                                                const float* high_quantiles,
                                                SymbolHandle* ret_sym_handle);
 
+/*!
+ * \brief Run subgraph pass based on the backend provided
+ * \param sym_handle symbol to be converted
+ * \param backend backend names for subgraph pass
+ * \param ret_sym_handle returned symbol
+ */
+MXNET_DLL int MXGenBackendSubgraph(SymbolHandle sym_handle, const char *backend,
+                                   SymbolHandle *ret_sym_handle);
+
 //--------------------------------------------
 // Part 4: Executor interface
 //--------------------------------------------

include/mxnet/ndarray.h

@@ -667,6 +667,12 @@ class NDArray {
   }
 
 #if MXNET_USE_MKLDNN == 1
+  /*
+   * Create NDArray from mkldnn memory.
+   * mkldnn_mem The mkldnn memory to be managed.
+   * static_data If true, mkldnn memory won't be freed on destruction.
+   */
+  explicit NDArray(const mkldnn::memory *mkldnn_mem, bool static_data = true);
   /*
    * Test if the data is stored in one of special MKLDNN format.
    */
@@ -742,6 +748,11 @@ class NDArray {
    * It's used by FullyConnected right now.
    */
   NDArray MKLDNNDataReshape(const TShape &shape) const;
+
+   /*!
+   * \ Fix mkldnn memory descriptor mismatch from NDArray.
+   */
+  void UpdateMKLDNNMemDesc();
 #endif
 
   /*!

include/mxnet/op_attr_types.h

@@ -300,6 +300,14 @@ using FQuantizedOp = std::function<nnvm::NodePtr (const NodeAttrs& attrs)>;
  */
 using FNeedRequantize = std::function<bool (const NodeAttrs& attrs)>;
 
+/*!
+ * \brief Register a function to determine if the input of a quantized operator
+ * needs to be quantized. This is usually used for the quantized operators
+ * which can handle fp32 inputs directly.
+ */
+using FAvoidQuantizeInput = std::function<bool (const NodeAttrs& attrs,
+                                                size_t index)>;
+
 }  // namespace mxnet
 
 #endif  // MXNET_OP_ATTR_TYPES_H_

mkldnn.mk

@@ -47,7 +47,7 @@ $(MKLDNN_LIBFILE):
 
 mkldnn_clean:
 	$(RM) -r 3rdparty/mkldnn/build
-	$(RM) -r 3rdparty/mkldnn/install/*
+	$(RM) -r $(MKLDNNROOT)
 
 ifeq ($(USE_MKLDNN), 1)
 mkldnn: mkldnn_build