matmul use fp32 compute_type #8733
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修复rec v3模型amp训练精度偏低问题：由于该模型中matmul调用BatchedGEMM，框架默认使用FP16累加因此会损失精度。
本PR通过环境变量FLAGS_gemm_use_half_precision_compute_type=False，使BatchedGEMM使用FP32累加，AMP-O1和O2可达到精度对齐。