Samyam Rajbhandari

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The pathogenesis of diabetic distal symmetrical polyneuropathy (DSP) is poorly understood but there is some evidence that the disease process might extend beyond peripheral nerves. We used magnetic-resonance imaging to measure spinal-cord cross-sectional area in diabetic patients with and without DSP and in healthy controls. There were significant(More)
In this paper, we introduce the Dynamic Load-balanced Tensor Contractions (DLTC), a domain-specific library for efficient task parallel execution of tensor contraction expressions, a class of computation encountered in quantum chemistry and physics. Our framework decomposes each contraction into smaller unit of tasks, represented by an abstraction referred(More)
Tensor contractions are extremely compute intensive generalized matrix multiplication operations encountered in many computational science fields, such as quantum chemistry and nuclear physics. Unlike distributed matrix multiplication, which has been extensively studied, limited work has been done in understanding distributed tensor contractions. In this(More)
Diabetic neuropathy (DN), an important microvascular complication of diabetes, is one of the major causes of morbidity in patients with diabetes. Studies have confirmed that glycaemic control and duration of diabetes are important factors for the development of DN. However, the exact mechanism of damage to peripheral nerves due to prolonged hyperglycaemic(More)
Tensor contractions represent the most compute- intensive core kernels in ab initio computational quantum chemistry and nuclear physics. Symmetries in these tensor contractions make them difficult to load balance and scale to large distributed systems. In this paper, we develop an efficient and scalable algorithm to contract symmetric tensors. We introduce(More)
The mechanism of neuropathic pain in the diabetic limb is far from clear. Phantom limb pain likewise is of obscure aetiology. The development of typical pain in an absent leg in a patient with diabetes many years after the amputation stimulates thought as to the mechanism, not only of neuropathic pain, but also of phantom limb pain. A 58-year-old man was(More)
The four-index integral transform is a fundamental and computationally demanding calculation used in many computational chemistry suites such as NWChem. It transforms a four-dimensional tensor from one basis to another. This transformation is most efficiently implemented as a sequence of four tensor contractions that each contract a four- dimensional tensor(More)
Loop fusion is a key program transformation for data locality optimization that is implemented in production compilers. But optimizing compilers for imperative languages currently cannot ex- ploit fusion opportunities across a set of recursive tree traversal computations with producer-consumer relationships. In this paper, we develop a compile-time approach(More)
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