Compile Getting Started with TVM command line driver - TVMC with wornings

WARNING:root:Attribute spatial is ignored in relay.sym.batch_norm WARNING:root:Attribute momentum is ignored in relay.sym.batch_norm WARNING:root:Attribute spatial is ignored in relay.sym.batch_norm WARNING:root:Attribute momentum is ignored in relay.sym.batch_norm WARNING:root:Attribute spatial is ignored in relay.sym.batch_norm WARNING:root:Attribute momentum is ignored in relay.sym.batch_norm WARNING:root:Attribute spatial is ignored in relay.sym.batch_norm WARNING:root:Attribute momentum is ignored in relay.sym.batch_norm WARNING:root:Attribute spatial is ignored in relay.sym.batch_norm WARNING:autotvm:Cannot find config for target=llvm -keys=cpu, workload=(‘conv2d_NCHWc.x86’, (‘TENSOR’, (1, 256, 56, 56), ‘float32’), (‘TENSOR’, (128, 256, 1, 1), ‘float32’), (1, 1), (0, 0, 0, 0), (1, 1), ‘NCHW’, ‘NCHW’, ‘float32’). A fallback configuration is used, which may bring great performance regression. WARNING:autotvm:Cannot find config for target=llvm -keys=cpu, workload=(‘conv2d_NCHWc.x86’, (‘TENSOR’, (1, 128, 56, 56), ‘float32’), (‘TENSOR’, (128, 128, 3, 3), ‘float32’), (2, 2), (1, 1, 1, 1), (1, 1), ‘NCHW’, ‘NCHW’, ‘float32’). A fallback configuration is used, which may bring great performance regression. WARNING:autotvm:Cannot find config for target=llvm -keys=cpu, workload=(‘conv2d_NCHWc.x86’, (‘TENSOR’, (1, 512, 28, 28), ‘float32’), (‘TENSOR’, (256, 512, 1, 1), ‘float32’), (1, 1), (0, 0, 0, 0), (1, 1), ‘NCHW’, ‘NCHW’, ‘float32’). A fallback configuration is used, which may bring great performance regression.

Can somebody help me ,please