Upgrade archive utility and add back FC improvement

This reverts commit 6543488.

ci/docker/Dockerfile.build.ubuntu_build_cuda

@@ -43,6 +43,8 @@ COPY install/ubuntu_clang.sh /work/
 RUN /work/ubuntu_clang.sh
 COPY install/ubuntu_mklml.sh /work/
 RUN /work/ubuntu_mklml.sh
+COPY install/ubuntu_ar.sh /work/
+RUN /work/ubuntu_ar.sh
 
 ENV CUDNN_VERSION=7.5.1.10
 COPY install/ubuntu_cudnn.sh /work/

ci/docker/install/ubuntu_ar.sh

@@ -0,0 +1,35 @@
+#!/usr/bin/env bash
+
+# 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.
+
+# build and install are separated so changes to build don't invalidate
+# the whole docker cache for the image
+
+wget https://mirror.clarkson.edu/gnu/binutils/binutils-2.27.tar.gz
+
+export DEBIAN_FRONTEND=noninteractive
+apt-get update || true
+apt-get install -y \
+    wget
+
+mkdir /opt/binutils_install && mkdir /opt/binutils_install && mkdir /opt/binutils && cd /opt/binutils
+wget -nv https://mirror.clarkson.edu/gnu/binutils/binutils-2.27.tar.gz
+./configure --prefix=/opt/binutils_install --exec-prefix=/opt/binutils_other
+make -j$(nproc)
+make install
+ln -s /opt/binutils_install/bin/ar /usr/local/bin/ar

src/operator/nn/fully_connected-inl.h

@@ -36,6 +36,7 @@
 #include "../elemwise_op_common.h"
 #include "../linalg.h"
 #include "../../common/utils.h"
+#include "../tensor/broadcast_reduce_op.h"
 
 namespace mxnet {
 namespace op {
@@ -169,7 +170,18 @@ void FCBackward(const OpContext &ctx, const FullyConnectedParam &param,
   // gradient of bias
   if (!param.no_bias) {
     Tensor<xpu, 1, DType> gbias = in_grad[fullc::kBias].get<xpu, 1, DType>(s);
-    Assign(gbias, req[fullc::kBias], sum_rows(grad));
+    TBlob grad_blob = TBlob(grad);
+    TBlob gbias_blob = TBlob(gbias);
+    mxnet::TShape x(1, 0);
+    mxnet::TShape small;
+    if (shape_assign(&gbias_blob.shape_, Shape2(param.num_hidden, 1))) {
+      small = gbias_blob.shape_;
+    } else {
+      small = ReduceAxesShapeImpl(grad_blob.shape_, dmlc::optional<mxnet::TShape>(x), true, false);
+    }
+    ReduceAxesComputeImpl<xpu, mshadow::red::sum, false, false,
+                          mshadow_op::identity>(ctx, {grad_blob}, {req[fullc::kBias]},
+                                                {in_grad[fullc::kBias]}, small);
   }
   // gradient of data
   // Legacy approach shown here for comparison:

src/operator/nn/fully_connected.cc

@@ -316,11 +316,9 @@ NNVM_REGISTER_OP(_backward_FullyConnected)
   const FullyConnectedParam& params = nnvm::get<FullyConnectedParam>(attrs.parsed);
   return params.no_bias ? 2 : 3;
 })
-#if MXNET_USE_MKLDNN == 1
 .set_attr<FResourceRequest>("FResourceRequest", [](const NodeAttrs& n) {
   return std::vector<ResourceRequest>{ResourceRequest::kTempSpace};
 })
-#endif
 .set_attr<nnvm::TIsBackward>("TIsBackward", true)
 .set_attr<nnvm::FInplaceOption>("FInplaceOption", [](const NodeAttrs& attrs){
   return std::vector<std::pair<int, int> >{{1, 0}};

tests/python/unittest/test_operator.py

@@ -696,6 +696,27 @@ def test_symbol_pow():
     check_symbolic_backward(test, [data_tmp, exp_tmp], [np.ones(shape)], [data_dir, exp_dir])
 
 
+@with_seed()
+def test_fully_connected():
+    data = mx.sym.var("data")
+    fc_weight = mx.sym.var("weight")
+    fc_bias = mx.sym.var("bias")
+    fc = mx.sym.FullyConnected(data=data, weight=fc_weight, bias=fc_bias, num_hidden=10, no_bias=False, name='fc')
+    data = mx.nd.random.uniform(shape=(5, 5, 5, 13), dtype=np.float32)
+    fc_weight = mx.nd.random.uniform(shape=(10, 325), dtype=np.float32)
+    fc_bias = mx.nd.random.uniform(shape=(10), dtype=np.float32)
+    fc_bias2 = mx.nd.random.uniform(shape=(10, 1), dtype=np.float32)
+    data_np = data.asnumpy().reshape(5, 325)
+    fc_weight_np = np.transpose(fc_weight.asnumpy())
+    fc_bias_np = fc_bias.asnumpy()
+    res = np.dot(data_np, fc_weight_np) + fc_bias.asnumpy()
+    check_symbolic_forward(fc, {'data': data_np, 'weight': fc_weight.asnumpy(), 'bias': fc_bias_np}, {'fc_output': res})
+    check_numeric_gradient(fc, {'data': data_np, 'weight': fc_weight.asnumpy(), 'bias': fc_bias_np},
+                           numeric_eps=1e-2, rtol=1e-4, atol=1e-2)
+    # TODO: Fix Bug #15032 when bias has ndim > 1
+    #check_symbolic_forward(fc, {'data': data_np, 'weight': fc_weight.asnumpy(), 'bias': fc_bias2.asnumpy()}, {'fc_output': res})
+
+
 @with_seed()
 def test_pow_fn():
     shape = (3, 4)